Epoxy Flooring Troubleshooting Guide

What Causes Bubbling in Epoxy Flooring After Installation?

A technical guide to bubbles, blisters, pinholes and craters in epoxy flooring, including concrete outgassing, moisture, mixing, application conditions, repair options and prevention.

Direct answer

Bubbling in epoxy flooring after installation is usually caused by air, vapour or moisture becoming trapped in or beneath the coating while it cures. Common triggers include concrete outgassing, rising slab temperature, excessive slab moisture, porous concrete, insufficient primer, air introduced during mixing or rolling, condensation, contamination and application outside the system’s specified conditions.

What causes bubbling in epoxy flooring after installation? The answer depends on when the bubbles appeared, what they look like and what is happening inside the concrete slab. A newly coated floor may develop tiny pinholes or circular craters while the resin is still curing. Another floor may look perfect for weeks before larger domed blisters begin appearing. Both defects may be called “bubbles”, but the mechanisms can be very different.

Fresh bubbles are commonly associated with concrete outgassing or air introduced during application. Concrete is porous. When a slab warms, air within those pores can expand and move toward the surface. If wet epoxy is curing at that moment, escaping air can pass through the resin and leave a bubble, pinhole or crater. Sherwin-Williams identifies outgassing as a common source of bubbles in freshly applied resinous flooring and explains that rising substrate temperature can drive air from concrete pores.

Bubbles that appear later may require a different investigation. Excess moisture moving through the slab can contribute to blistering and coating debonding. ASTM F2170 addresses internal relative-humidity testing in concrete slabs and notes that excessive slab moisture can contribute to deterioration and debonding of coatings.

For factories, warehouses and commercial facilities, that distinction matters. Patching a cosmetic outgassing defect is not the same job as repairing a floor with widespread moisture-related blistering. Floorzy Makeover’s current failed epoxy floor assessment and repair service begins by checking the coating and concrete condition before deciding whether local repair, coating removal, resurfacing or recoating is appropriate.

In short: do not treat every bubble as a simple surface defect. First determine whether the defect came from air moving through porous concrete, moisture below the coating, the way the epoxy was mixed or rolled, contamination, or unsuitable environmental conditions.

What Do Bubbles in Epoxy Flooring Actually Mean?

A bubble is a visible symptom created when gas, vapour, air or liquid pressure disrupts the coating while it is wet or after it has cured. The shape and timing of the defect help narrow the likely cause.

Defect	Typical Appearance	Possible Mechanism
Outgassing bubble	Small circular bubble, crater or ring, sometimes with a central pinhole	Air escaping from porous concrete during cure
Pinhole	Tiny open hole through a coating layer	Escaping air, porous substrate or incomplete sealing
Blister	Raised dome or larger bubble in cured coating	Moisture, osmotic pressure, trapped material or loss of adhesion
Fisheye	Round depression where coating pulls away	Surface contamination such as oil or silicone
Micro-bubbled finish	Many very small bubbles across the film	Air introduced by high-speed mixing or aggressive rolling

Sherwin-Williams describes outgassing defects as small circles or crater-like structures that can have a visible pinhole where air escaped from the slab. By comparison, a large blister that appears after the floor has been in service may require investigation of slab moisture, contamination or adhesion failure.

Different defects can also occur on the same floor. A porous slab may produce outgassing pinholes during primer application while another area near a wash zone has a moisture problem. This is why a professional assessment looks at the full pattern instead of assuming one cause across the entire floor.

10 Major Causes of Bubbling in Epoxy Flooring After Installation

The following causes cover the most common mechanisms behind epoxy floor bubbles, pinholes, craters and blisters. Several can occur together, especially on older industrial concrete.

Concrete Outgassing

Concrete outgassing is one of the most common reasons bubbles appear in freshly applied epoxy. Concrete contains pores and microscopic air spaces. When the slab temperature rises, air within those pores expands and can move toward the surface. If an epoxy primer or coating is curing at that time, the air may push through the wet film.

Sherwin-Williams states that outgassing can create blisters, craters, bubbles and pinholes in resinous flooring. The defect is often circular, and a tiny central pinhole may be visible where gas escaped. The more porous the concrete and the greater the temperature rise, the greater the potential for air movement.

This explains why epoxy bubbling can occur even when the slab is clean and the resin was mixed correctly. The source of the air is the concrete itself.

Rising Concrete Temperature During Cure

Outgassing becomes more likely when concrete is warming after the coating is applied. Direct sunlight, a hot roof, heaters, warm air entering a building or a large difference between morning and afternoon temperature can all raise slab temperature.

Sherwin-Williams explains that increasing substrate temperature causes air in concrete to expand and escape. Its technical guidance recommends timing the initial sealing coat so substrate temperature is warm and then decreasing when the specific product and site conditions allow this.

This is why measuring only the room temperature is not enough. The slab itself can be heating even when the air feels comfortable, and that temperature trend can influence whether gas moves out of the concrete or is drawn back into it.

Excess Moisture in the Concrete Slab

Moisture is an important cause of epoxy blistering, particularly when defects appear after the coating has cured. Concrete can contain residual construction moisture or receive moisture from below, leaks, cleaning processes or an ineffective vapour barrier.

ASTM F2170 notes that excessive moisture permeating from concrete slabs can contribute to failures such as debonding and deterioration of coatings. Moisture-related problems are therefore different from a simple air bubble trapped during rolling. They can affect the bond between coating and concrete and may continue to develop after installation.

If larger blisters recur after local patching, or if exposed concrete beneath failed coating appears damp or shows moisture-related signs, concrete moisture testing should be considered before another epoxy floor repair.

Very Porous or Open Concrete

Some slabs contain more interconnected pores than others. Mechanical grinding can also open the surface and expose pores. When wet resin is spread across highly porous concrete, air can be displaced from those pores and appear as bubbles in the coating.

A correctly selected primer is intended to wet the concrete and help seal porosity before thicker coats are applied. Sherwin-Williams application instructions for resinous flooring note that a primer coat can help seal concrete pores and minimise outgassing bubbles.

Extremely porous concrete may need more attention than dense concrete. The correct primer coverage and number of coats depend on the system, substrate absorption and product instructions.

Insufficient Primer or Poor Pore Sealing

If porous concrete is not adequately sealed before a body coat or finish coat is installed, trapped air can continue travelling through the system. This can create pinholes or small bubbles in later layers even when those later layers are otherwise applied correctly.

Primer selection and application rate are therefore part of controlling epoxy floor bubbling. Some substrates absorb primer heavily. Others contain bugholes or voids that need compatible filling before the next coat is installed.

The objective is not simply to add more primer. The objective is to create a continuous, well-bonded seal that wets the substrate and limits pathways for air to reach subsequent resin layers.

Air Introduced by High-Speed Mixing

Two-component epoxy must be mixed thoroughly, but mixing too aggressively can whip air into the liquid resin. Those entrained air bubbles may remain in the material long enough to become visible in the cured film.

Sherwin-Williams’ technical guidance on bubbly epoxy identifies high-speed mixing as one way air can become trapped in coating material and recommends controlled mixing according to product instructions.

The correct procedure depends on the coating manufacturer. The installer should use the specified mixing blade, speed, duration and sequence. Thorough mixing matters, but faster is not automatically better.

Aggressive Rolling or the Wrong Roller Cover

Air can also be introduced after epoxy is poured onto the floor. Rolling too quickly, repeatedly working partially curing material or using an unsuitable roller cover can aerate the coating and leave micro-bubbles.

Application tools are part of the flooring system. Roller nap, lint resistance, squeegee type and back-rolling technique should follow the product data. Even pressure and controlled passes are preferable to overworking material after it has begun reacting.

If bubbles are distributed uniformly through the coating rather than emerging from individual points in the concrete, mixing and rolling technique should be considered in the diagnosis.

Condensation, High Humidity or Dew-Point Problems

A floor can look dry but still be too close to the dew point for coating. If substrate temperature falls to the point where moisture condenses, a microscopic film of water can interfere with wetting, cure and adhesion.

Environmental control involves more than checking air temperature. Installers should consider ambient temperature, relative humidity, substrate temperature and the coating manufacturer’s required margin above dew point. Sherwin-Williams application guidance for resinous flooring includes substrate-temperature and dew-point controls.

Condensation-related defects may later be confused with moisture coming through the slab, so installation records can be valuable during troubleshooting.

Oil, Silicone, Grease or Other Surface Contamination

Not every circular defect is an air bubble. Oil, silicone, mould-release agents and other contaminants can cause wet epoxy to pull away locally, producing round depressions often described as fisheyes.

Industrial concrete is especially vulnerable because lubricants, hydraulic oil, machining fluids, tyre residues and maintenance chemicals can penetrate the slab over time. Surface preparation must remove bond-breaking contamination, not simply make the floor look visually clean.

If defects are concentrated near machines, service bays or older oily areas, contamination should be investigated before recoating.

Applying the Coating Too Thickly, Too Late or Outside Its Working Time

Epoxy has a limited pot life and a specified application thickness. If mixed material is kept too long, applied outside the working window or spread at an unsuitable thickness, its flow, air release and curing behaviour can change.

A thick film can make it harder for trapped air to escape before the coating sets. Material that has already begun reacting in the mixing pail can also become more difficult to level and roll correctly. Recoat windows matter as well because badly timed layers can create intercoat problems.

The safest rule is to follow the technical data for the specific product rather than applying one universal procedure to every epoxy system.

What Does the Timing of the Bubbles Tell You?

When bubbles first become visible is one of the most useful diagnostic clues. It can help separate air-related application defects from later moisture or adhesion problems.

When the Defect Appears	More Likely Causes	What to Investigate
During primer application	Concrete outgassing, porous slab	Slab-temperature trend, pores, bugholes and primer penetration
While finish coat is wet	Outgassing, high-speed mixing, aggressive rolling	Mixing technique, tools, temperature and primer seal
Next day as tiny craters	Popped outgassing bubbles or entrained air	Central pinholes, distribution and substrate porosity
Days or weeks later	Moisture, contamination, loss of adhesion	Slab moisture, underside of blister and bond condition
Only near machinery or oily areas	Contamination	Oil/chemical history and depth of contamination
Only in sun-heated areas	Temperature-driven outgassing	Direct sunlight and slab-temperature rise during cure

These are indicators rather than absolute rules. A moisture problem can exist from day one, and outgassing can sometimes be severe enough to affect several layers. The purpose of the table is to guide investigation, not replace site assessment or testing.

Concrete Outgassing vs Moisture Blistering: What Is the Difference?

Outgassing is primarily the movement of air or gas from pores in concrete through a curing coating. Moisture blistering involves water or water vapour contributing to pressure, chemical changes or loss of adhesion below the cured coating.

Outgassing bubbles usually form during application or early cure. They tend to appear as small circular defects, bubbles or craters and can have a pinhole in the centre. They are often linked to porous concrete and rising substrate temperature.

Moisture-related blisters may appear later and can be associated with broader coating debonding. ASTM F2170 is used to quantify internal relative humidity in concrete slabs, and ASTM notes that flooring and coating manufacturers commonly require moisture testing before installation.

The main difference is timing and mechanism: outgassing pushes air through wet resin as it cures; moisture problems can continue acting beneath a cured floor. If defects are widespread, recurring or accompanied by loss of adhesion, moisture should not be ruled out without investigation.

Are Bubbles in Epoxy Flooring a Serious Problem?

Some epoxy bubbles are mainly cosmetic; others can indicate a developing flooring failure. A few isolated outgassing pinholes in a well-bonded coating are different from hundreds of moisture-driven blisters across a warehouse.

Lower concern

Isolated surface pinholes

A few small outgassing defects may be locally repairable if the surrounding coating remains firmly bonded and the cause has stopped.

Needs investigation

Repeated clusters of bubbles

Large numbers of defects can indicate porous concrete, inadequate primer sealing, application technique or continuing outgassing.

Higher concern

Large or growing blisters

Blisters that grow, recur or release coating from the slab can indicate moisture, contamination or broader adhesion failure.

Do not judge severity only by appearance. A small blister can reveal a larger area of weak adhesion, while a visible crater may be only an isolated outgassing defect. The condition of the surrounding coating and the underside of failed material are important clues.

How Professionals Diagnose Bubbling in Epoxy Flooring

A professional diagnosis tries to identify the failure mechanism before prescribing a repair. For industrial floors, that means looking beyond the visible topcoat.

Map the defect pattern

Record whether bubbles are isolated, widespread, near equipment, near doors, in sunlit zones or linked to washing and moisture areas.

Check when the bubbles appeared

Defects noticed during cure suggest a different mechanism from blisters that developed weeks later.

Inspect the shape

Small circular craters with a centre pinhole can indicate outgassing. Fisheye-shaped depressions can suggest contamination.

Inspect the underside of failed coating

Look for clean coating, dampness, concrete particles, salts or contamination that may help identify the failure plane.

Review preparation and application records

Grinding, primer, mixing, pot life, thickness, recoat timing and environmental readings can reveal application-related causes.

Assess slab moisture where appropriate

If moisture is suspected, use an appropriate test method and compare results with the flooring system’s published limits.

Evaluate substrate condition

Weak, dusting or highly porous concrete may need repair or additional preparation before recoating.

Determine repair scope

Decide whether isolated patching is suitable or broader removal and recoating will be more reliable.

Can Bubbling Epoxy Flooring Be Repaired?

Yes, many bubbling defects can be repaired, but the method depends on the cause and extent. Repairing a few outgassing craters is very different from repairing widespread moisture blistering.

Scenario 1

Few isolated bubbles

If adhesion is sound, local sanding or grinding, cleaning, patching and recoating may be sufficient according to the coating system’s repair procedure.

Scenario 2

Many bubbles in one area

The affected coat may need broader abrasion and recoating after the outgassing, primer or application problem is corrected.

Scenario 3

Large recurring blisters

Moisture, contamination or adhesion failure may require removal to sound concrete, testing and a revised flooring build-up.

Sherwin-Williams notes that some outgassing defects found after finish-coat installation can be sanded and patched, while widespread defects may require recoating. The actual procedure remains product-dependent and should follow the selected flooring system.

The critical rule is to correct the mechanism before applying another coat. Otherwise, new bubbles or blisters can appear through the repair.

How Professionals Repair a Bubbling Epoxy Floor

A professional repair sequence normally follows these stages, adjusted to the actual floor condition:

Inspect the full area

Confirm whether the problem is cosmetic, localised or part of broader delamination.

Identify outgassing, moisture or application cause

Use timing, appearance, substrate condition and testing to separate likely mechanisms.

Remove loose or defective coating

Sand, grind or remove affected material until a stable surface is reached.

Assess and prepare the concrete

Mechanically prepare the substrate where necessary and remove weak material, laitance and contamination.

Repair pinholes, voids and concrete defects

Porous or damaged zones may need compatible patching before the new coating is installed.

Address moisture if present

Do not treat moisture blistering as a simple topcoat defect. The slab condition and system limits have to be considered.

Prime and seal the substrate correctly

A suitable primer helps wet the concrete and seal porosity before subsequent resin layers.

Control application conditions

Monitor substrate temperature, humidity, dew point and the temperature trend of the slab.

Mix and apply to system data

Control mixing speed, ratio, pot life, roller technique, coverage and film thickness.

Allow full cure before service

Protect the repaired floor from premature traffic, water and chemical exposure until required cure is reached.

How to Prevent Bubbles in Epoxy Flooring

Preventing epoxy floor bubbles starts before the finish coat is opened. The substrate, primer, temperature and application method all influence whether air or moisture becomes trapped.

Inspect concrete porosity and condition. Highly porous, weak or damaged concrete may need additional repair or sealing.
Check slab moisture where required. Use the method and acceptance limits appropriate to the selected flooring system.
Mechanically prepare concrete correctly. Remove laitance, weak material, old coatings and contamination while producing the required profile.
Remove grinding dust completely. Dust can interfere with primer wetting and adhesion.
Use the correct primer. Adequate pore sealing can reduce outgassing into later coats.
Watch the slab-temperature trend. Where product guidance permits, applying the initial sealing coat while slab temperature is decreasing can reduce outgassing risk.
Control dew point and humidity. Keep the substrate within the environmental limits specified by the coating manufacturer.
Mix at the specified speed. Avoid whipping unnecessary air into the resin.
Use the specified roller or squeegee. Do not over-roll or aggressively work material as it begins to cure.
Respect pot life and working time. Do not continue using epoxy after it moves outside its application window.
Apply the specified film thickness. Excessive thickness can affect levelling, air release and cure.
Investigate recurring blisters before recoating. Repeated bubbling may indicate moisture or a deeper substrate issue rather than a one-time defect.

DIY Epoxy vs Professional Epoxy Flooring When Bubbling Is a Risk

Small residential epoxy projects can sometimes be completed successfully with DIY systems when the slab is simple, dry and in good condition. Industrial and commercial floors are more complicated because installers may need to control slab moisture, concrete porosity, large-area temperature changes, old contamination and production traffic.

Factor	Typical DIY Approach	Professional Flooring Installation
Concrete porosity	Usually judged visually	Assessed during preparation and priming
Moisture assessment	Often limited	Testing selected when slab conditions require it
Surface preparation	Cleaning or small grinder	Mechanical preparation matched to the system
Substrate temperature	Often not measured	Monitored with ambient conditions and dew point
Primer selection	Generic kit primer	Selected for concrete condition and system design
Mixing/application	Technique varies	Controlled ratio, mixing speed, pot life and tool selection
Repair diagnosis	Bubble may simply be sanded	Outgassing, moisture, contamination and adhesion are separated before repair

For a factory, warehouse or commercial facility, professional installation is not only about obtaining a smoother finish. It is about understanding the concrete and managing the conditions that can cause epoxy bubbling in the first place.

Why Choose Floorzy Makeover for Bubbling or Failing Epoxy Floors?

Floorzy Makeover’s current website focuses on industrial flooring, concrete restoration and purpose-specific floor systems for factories, warehouses and commercial facilities. For an existing epoxy problem, Floorzy also has a dedicated page for peeling, worn or failing epoxy floors.

Floorzy’s published approach begins by assessing the existing coating, concrete condition, moisture-related signs, contamination, traffic and operating environment. The repair scope can then be defined as local repair, coating removal, resurfacing or recoating rather than automatically placing another layer over the defect.

For a replacement system, Floorzy publishes different options for different conditions, including Interior Semi Gloss epoxy flooring, Heavy Load Industrial systems, ESD flooring and Screed Plus concrete levelling and repair. This supports an important technical principle: flooring should be chosen around substrate condition and operating duty, not only appearance.

When should you contact Floorzy Makeover?

New epoxy has developed widespread bubbles or pinholes.
Blisters appeared days or weeks after installation.
Bubbles return after previous patch repairs.
Moisture under the floor is suspected.
Concrete is old, porous, damaged or oil-contaminated.
A factory or warehouse needs the cause identified before another coating is installed.
The current system is failing under forklift, machinery or industrial traffic.

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Frequently Asked Questions About Epoxy Floor Bubbling

1. What causes bubbling in epoxy flooring after installation?

Bubbling in epoxy flooring after installation is commonly caused by concrete outgassing, moisture in the slab, rising substrate temperature, porous concrete, insufficient primer, air introduced by high-speed mixing, aggressive rolling, condensation or contamination. Bubbles that form during application often point toward outgassing or entrained air, while larger blisters that develop later can require investigation of moisture and adhesion.

2. Why did bubbles appear in my epoxy the next day?

Next-day bubbles or small craters are often the remains of bubbles that formed while the coating was curing. Concrete outgassing is a common cause because air leaves pores in the slab and travels through wet resin. Air introduced during mixing or rolling can create similar defects. Look for small circular craters, clusters and central pinholes, then review slab temperature and application conditions.

3. Is moisture always the reason epoxy floors bubble?

No. Moisture is an important cause of blistering and coating failure, but fresh epoxy bubbles are frequently caused by outgassing or trapped air. Mixing technique, roller choice, concrete porosity and rising substrate temperature can all produce bubbles without a major moisture problem. If blistering develops after cure, spreads or recurs after repair, slab moisture deserves closer investigation.

4. What is concrete outgassing in epoxy flooring?

Concrete outgassing is the movement of air or gas out of pores in the concrete slab. As the slab warms, air expands and can escape through a coating that is still curing. The result may be small bubbles, circular craters or pinholes. Outgassing is more likely in porous concrete and when substrate temperature is rising after epoxy application.

5. How can I tell an outgassing bubble from a moisture blister?

Outgassing defects commonly appear during application or early cure as small circles, craters or pinholes. Moisture blisters may develop later, become larger and be associated with loss of adhesion. These are only clues. For serious or widespread problems, the floor should be inspected and moisture testing considered rather than relying only on appearance.

6. Can high-speed mixing cause bubbles in epoxy?

Yes. Mixing epoxy too aggressively can introduce air into the liquid material. If those bubbles do not escape before the resin cures, they may remain visible in the finished floor. Follow the coating manufacturer’s required mixing blade, speed, time and sequence. Thorough mixing is essential, but faster is not necessarily better.

7. Can rolling epoxy too fast create bubbles?

Yes. Aggressive or very rapid rolling can introduce air into some coating systems, particularly if an unsuitable roller cover is used or material is repeatedly worked as it starts to cure. Professional installers use the roller nap, squeegee and back-rolling method specified for the product and avoid overworking material outside its working time.

8. Why does porous concrete make epoxy bubble?

Porous concrete contains air-filled voids. When epoxy wets the surface, air can be displaced from those pores, and warming of the slab can push additional air outward. If the primer has not sealed the pores before subsequent coats are applied, escaping air can create bubbles or pinholes. Proper preparation and primer selection help manage this risk.

9. Can primer prevent epoxy bubbles?

A suitable primer can help wet concrete, seal pores and reduce outgassing into later coating layers. However, no primer can compensate for every substrate condition. Highly porous concrete, bugholes, moisture or contamination may require additional treatment. The primer must also be compatible with the complete epoxy flooring system and applied at the specified coverage.

10. Can humidity cause epoxy floor bubbles?

High humidity can contribute to coating problems, particularly when concrete surface temperature approaches the dew point and condensation forms. The specific effect depends on the resin chemistry. Installers should measure ambient conditions and substrate temperature and follow the flooring manufacturer’s permitted humidity, temperature and dew-point limits.

11. Can bubbles be sanded out of epoxy flooring?

Some isolated surface bubbles or craters can be sanded or ground, cleaned, patched and recoated if surrounding floor is firmly bonded and the original cause has been corrected. Widespread blistering should not be treated as a simple sanding job because moisture, contamination or broader adhesion failure may exist underneath the coating.

12. Do I need to remove the whole epoxy floor if it has bubbles?

Not automatically. A few isolated outgassing defects may be locally repairable. Widespread bubbles, large blisters, recurring defects or inconsistent adhesion can justify broader removal. The decision should be based on how much coating is actually sound and what caused the defects, rather than only the visible number of bubbles.

13. Can moisture testing help diagnose epoxy blistering?

Yes. When moisture is suspected, concrete moisture testing can help determine slab condition. ASTM F2170 uses in-situ probes to determine internal relative humidity in concrete slabs. Results should be interpreted against the selected flooring system’s published limits and in the context of the building, vapour barrier and possible moisture source.

14. Why are there tiny pinholes in my epoxy floor?

Tiny pinholes are commonly associated with air escaping from porous concrete through a wet coating. They may be the centre of a small outgassing crater or remain as an open pore after a bubble pops. Inadequate pore sealing, porous substrate and rising slab temperature can all contribute.

15. Why do epoxy bubbles appear mainly in sunny areas?

Direct sunlight can heat the concrete slab, causing air in its pores to expand and escape. If a coating is curing while slab temperature rises, outgassing becomes more likely. This is why professional epoxy installation considers the substrate-temperature trend and not only room temperature when deciding when to prime and coat a floor.

16. Can Floorzy Makeover repair bubbling epoxy flooring?

Floorzy Makeover publishes a dedicated service for peeling, worn and failing epoxy floors. Its process includes assessing the existing coating and concrete, checking moisture-related signs and contamination, defining repair scope, removing failed coating, mechanically preparing concrete, repairing damaged areas and applying the selected flooring system. Contact Floorzy for a site-specific assessment.

17. How can I prevent bubbles when recoating an epoxy floor?

Before recoating, identify why the previous bubbles formed. Prepare concrete or existing coating correctly, address moisture and contamination, seal porous concrete with the specified primer, monitor substrate temperature and dew point, mix at the correct speed, use the correct tools and apply within the coating’s pot life, coverage and thickness limits.

Technical References

Sherwin-Williams High Performance Flooring — Why Does My Epoxy Floor Have Bubbles?
Sherwin-Williams High Performance Flooring — Outgassing and Outgas Bubbles
ASTM F2170 — Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes
Sherwin-Williams High Performance Flooring — Why Is My Epoxy Floor Bubbly or Gummy the Next Day?
Sherwin-Williams High Performance Flooring — Resuflor Screed Deco Flake II Application Instructions

Featured-Snippet Quick Answers

What causes bubbles in epoxy flooring?

Bubbles in epoxy flooring are commonly caused by concrete outgassing, trapped air, moisture, porous concrete, insufficient primer, high-speed mixing, aggressive rolling, condensation or unsuitable application conditions. The timing and appearance of the defect help determine the likely cause.

How do you fix bubbles in an epoxy floor?

Identify the cause first, then remove or sand defective coating, repair and prepare the substrate, address moisture or contamination where present, seal porous concrete with the specified primer and recoat within the flooring system’s application requirements.

Can concrete moisture make epoxy blister?

Yes. Excess moisture in a concrete slab can contribute to coating debonding and blistering. Where moisture is suspected, professional slab testing and comparison with the flooring manufacturer’s limits should be completed before selecting a repair or replacement system.

Is Your Epoxy Floor Bubbling or Blistering?

Do not simply sand the visible bubbles and apply another coat without understanding why they formed. Outgassing, moisture, concrete porosity, contamination or application conditions can create similar-looking defects. Floorzy Makeover can assess the existing floor and help determine whether the right solution is a local repair, broader coating removal, concrete restoration or a correctly specified replacement flooring system.

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