03 Jun Why Are There Bubbles in My Epoxy Flooring? Common Causes Explained
Epoxy flooring is widely admired for its sleek appearance, durability, and low maintenance. But even a high-quality epoxy job can face unexpected challenges—like bubbling. Whether you’re applying epoxy in a garage, commercial space, or pickleball court, understanding why bubbles form is key to achieving that flawless finish.
Let’s explore the top causes of bubbles in epoxy flooring, how to prevent them, and how San Diego property owners can fix them.
For guaranteed professional results, trust Pristine Coatings—San Diego’s top-rated epoxy flooring company.
🧱 What Is Epoxy Flooring?
Epoxy flooring is a thermosetting resin applied over concrete, forming a smooth, durable, and glossy finish. Popular in residential garages, commercial spaces, and athletic courts, epoxy offers exceptional resistance to wear and chemicals.
Looking for a garage upgrade? Explore garage floor epoxy solutions designed for San Diego homes.
Or discover our high-performance pickleball court coatings built to withstand active use and weather elements.
🔍 Common Causes of Bubbles in Epoxy Floors
1. Outgassing from the Concrete Substrate
Outgassing happens when trapped air or moisture in the concrete rises and creates surface bubbles during curing. Common culprits:
- Inadequate surface prep
- Moisture trapped in the slab
- Rapid temperature shifts
Prevention Tip: Use a moisture barrier primer and allow the concrete to fully dry before application.
2. Improper Mixing
Improperly mixing epoxy resin and hardener introduces air into the blend, resulting in bubbles.
✅ Mixing Tip: Use a slow-speed paddle mixer, blend components thoroughly, and allow the mixture to rest for 2–3 minutes before pouring.
3. Environmental Conditions (Humidity & Temperature)
Epoxy is sensitive to:
- Humidity levels over 80%
- Sudden temperature changes
In coastal areas like San Diego, it’s crucial to monitor climate conditions.
For professional applications that factors in local climate, trust our expert team to handle your epoxy flooring needs.
4. Surface Contamination
Dust, oil, grease, and debris on the surface interfere with adhesion, forming bubbles and pinholes.
✅ Solution: Conduct a deep clean, diamond grind the floor and vacuum thoroughly before epoxy application.
5. Incorrect Application Techniques
Using the wrong tools or applying thick layers too quickly can result in trapped air bubbles.
- Avoid foam rollers or brushes
- Use spiked rollers to remove air during application
- Apply multiple thin coats for best results
💡 For best practices, check our blog where we share expert tips, guides, and flooring insights.
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How to Prevent Bubbles in Epoxy Flooring
🔧 Issue | 💡 Root Cause | ✅ Prevention Strategy |
Outgassing | Moisture/air in substrate | Use vapor barrier primer, ensure full drying |
Poor Mixing | Air whipped into resin | Mix slowly and allow induction time |
Humidity & Temperature | Poor curing due to conditions | Apply in controlled environment |
Dirty Surface | Contaminants prevent adhesion | Deep clean and dry substrate |
Wrong Tools/Techniques | Trapped air and uneven coating | Use spiked rollers and apply in layers |
🛠️ How to Fix Epoxy Bubbles
Step 1: Sand Down the Surface
Use a mechanical sander or orbital buffer to smooth out raised bubbles.
Step 2: Clean the Area
Vacuum and wipe down the floor to remove dust before recoating.
Step 3: Reapply Epoxy
Apply a thin, even layer of epoxy using the correct mixing and application methods.
Need help? Contact our team for a professional fix or reapplication service.
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Local Trends: Epoxy Flooring in San Diego
San Diego’s epoxy flooring demand is booming—especially in:
- Garages
- Commercial warehouses
- Athletic courts like pickleball facilities
According to Grand View Research, the U.S. concrete coatings market reached $323 million in 2022 and is projected to grow at 4.9% CAGR through 2030.
That’s why concrete polishing and epoxy flooring are among the fastest-growing services in Southern California.
🏢Who Is Pristine Coatings?
As San Diego’s trusted epoxy experts, Pristine Coatings offers top-tier services including:
From initial consultation to post-installation care, our licensed team ensures your floor looks professional and performs flawlessly.
🧠Final Thoughts
Bubbles in epoxy flooring can be frustrating—but with the right techniques and experienced support, you can prevent or repair them easily.
✅ Monitor conditions
✅ Use quality materials
✅ Prep thoroughly
✅ Trust professionals when in doubt
👉 Ready to install or refinish your epoxy floor? Get in touch with Pristine Coatings today for a free estimate and a bubble-free finish!