If you’ve ever noticed tiny holes or bubbles forming in freshly applied epoxy, you’ve seen the effects of outgassing — a common issue that can ruin an otherwise perfect finish. These small pinholes may look minor, but they compromise durability, adhesion, and appearance. Understanding what causes outgassing and how to prevent it ensures your new epoxy floor coating looks flawless and lasts for years.

At Superior Garage Floors USA, we’ve perfected the art of professional floor preparation and installation. Serving Phoenix, Scottsdale, Mesa, Chandler, and surrounding cities, our team specializes in epoxy floors, metallic floors, epoxy flake flooring, resin floors, and concrete coatings that resist pinholes, peeling, and bubbles from the very start.

What Is Outgassing?

Outgassing occurs when air escapes from the concrete during or after the epoxy application process. Concrete is porous, meaning it contains small air pockets that trap air, moisture, or gas. When epoxy is applied, the coating seals the surface and heats slightly during curing. This causes the trapped air to expand and rise to the surface, forming tiny holes known as pinholes.

Although pinholes may not affect performance immediately, they can allow moisture or contaminants to seep in over time, leading to peeling, discoloration, or weakened adhesion.

Why It Happens After Surface Prep

Surface preparation is essential for epoxy adhesion, but improper timing or technique can trigger outgassing. Grinding, shot blasting, or etching opens the concrete pores, allowing trapped air to escape. If epoxy is applied before the concrete “rests” or re-stabilizes, the outgassing process will continue under the coating.

Common causes include:

• Applying epoxy too soon after grinding or cleaning

• Rising substrate temperature during curing

• Applying coatings in direct sunlight

• High humidity or moisture in the slab

• Inadequate primer or sealer use

Proper prep and timing make all the difference.

How to Prevent Pinholes and Bubbles

Preventing outgassing requires a careful balance of temperature, timing, and product application. Here’s how professionals ensure smooth, bubble-free epoxy floors every time.

1. Monitor Temperature and Conditions

Concrete “breathes” based on temperature. When it’s cooler, the concrete draws air in; when it warms up, it releases air. To avoid outgassing, always apply epoxy as the temperature is falling, not rising. Late afternoon or evening is typically best in Arizona’s climate.

2. Allow the Concrete to Rest After Prep

After grinding or cleaning, allow the slab to rest for several hours before coating. This pause gives the air within the pores time to equalize, reducing the risk of trapped gas escaping later.

3. Use a Quality Primer

Applying a penetrating epoxy primer is one of the best ways to prevent outgassing. Primers soak into the pores, sealing them and creating a strong base layer before the main coating is applied. This step significantly reduces pinholes.

4. Apply Coatings in Thin Layers

Thick epoxy applications trap more air. Applying thinner coats allows gases to escape before the surface seals. Professionals use multiple thin layers to ensure both beauty and strength.

5. Avoid Direct Sunlight or Heat

Arizona’s climate can cause rapid temperature swings that lead to outgassing. Avoid applying epoxy to surfaces exposed to sunlight or high heat. If necessary, work during cooler hours or use shading to keep conditions consistent.

6. Check for Moisture Before Coating

Even small amounts of moisture in the concrete can cause vapor pressure, pushing air or water through the epoxy as it cures. Always conduct a moisture test before installation, especially for garages and driveways.

How We Handle Outgassing Prevention

At Superior Garage Floors USA, our technicians follow a proven process designed to eliminate pinholes and ensure a perfect finish.

1. Comprehensive Surface Prep: We diamond-grind every surface to open the pores evenly.

2. Vacuum Cleaning: Dust and contaminants are completely removed before priming.

3. Priming and Sealing: We apply high-quality epoxy primers that penetrate deep into the concrete.

4. Controlled Application: Epoxy coatings are applied under optimal temperature and humidity conditions.

5. Professional Finishing: Each layer is inspected and smoothed for a flawless, glossy result.

This level of care ensures every epoxy flake flooring, metallic floor, or resin coating we install in the Phoenix area performs perfectly — without outgassing or surface imperfections.

Real Homeowner Experiences

Alex D., Scottsdale:
“We had another company coat our garage, and it was full of pinholes. Superior Garage Floors removed it, prepped correctly, and the new floor is flawless — not a single bubble.”

Megan H., Chandler:
“They explained everything about timing and curing. The result is stunning, and even after a year, the surface still looks brand new.”

Robert L., Mesa:
“I work in construction and know how common outgassing issues are. Superior Garage Floors handled the prep perfectly — their experience really shows.”

Benefits of a Professional Installation

Choosing an expert team prevents costly mistakes and guarantees a lasting result. Benefits include:

• Seamless, glossy finish with zero pinholes

• Better adhesion for long-term durability

• Resistance to Arizona heat and expansion

• Fast installation with same-day epoxy options

• Custom finishes including flake, metallic, and solid-color systems

When installed properly, your epoxy floor will not only look better but also last longer, resist damage, and clean up easily.

FAQs

What are pinholes in epoxy floors?
Pinholes are tiny bubbles or holes caused by trapped air escaping through the coating as it cures.

Can pinholes be repaired?
Yes. Minor pinholes can be filled with a new topcoat, but widespread issues require sanding and reapplication.

How do I know if my concrete is prone to outgassing?
Older or oil-soaked concrete and floors exposed to heat or sunlight are more likely to outgas. Proper moisture and temperature testing will identify the risk.

Do all epoxy floors need a primer?
While not always mandatory, primers are strongly recommended — especially for porous or newly ground concrete — to seal pores and prevent outgassing.

Why Choose Superior Garage Floors USA

• Sherwin Williams epoxy paint floor systems

• Same-day epoxy flooring options

• Expert installers trained in outgassing prevention

• Serving Phoenix, Scottsdale, Mesa, Chandler, Gilbert, and nearby cities

• Durable, Arizona-ready coatings that resist pinholes and peeling

Our epoxy systems are designed for performance and beauty, giving homeowners peace of mind and long-term protection.

Call to Action

Don’t let pinholes ruin your epoxy investment. Choose professionals who understand the science of outgassing prevention and guarantee a smooth, bubble-free finish.

Call today at (623) 499-7878 to schedule your free estimate!