When considering a garage flooring project, one of the most overlooked yet critical factors is how moisture and UV exposure impact the long-term durability and appearance of the coating. Many reputable companies—even those that have been in business for several years—are still using 100% solid epoxy basecoats for residential garage floors.
While 100% solid epoxy is a commonly used moisture vapor barrier (MVB) basecoat, it presents significant challenges when exposed to direct sunlight—a reality for any garage where the door is frequently open. Unfortunately, some contractors continue to install two-coat systems without fully understanding the limitations of this approach, leading to discoloration and reduced performance over time.
The Problem with Using 100% Solid Epoxy as a Basecoat
1. Moisture Vapor Barrier Effectiveness is Compromised
When a contractor applies 100% solid epoxy as a moisture vapor barrier and then broadcasts flakes directly into it, they risk creating small pores or imperfections in the coating. These tiny exposed areas allow moisture to pass through, reducing the MVB’s overall effectiveness.
If moisture is still able to migrate through the surface, the risk of adhesion failure, bubbling, or premature wear increases significantly. A true moisture vapor barrier should be fully sealed before any flake broadcast occurs.
2. UV Exposure Causes Discoloration
Based on UV acceleration tests conducted at Tru Grit Coatings, we have found that even high-quality, UV-enhanced 100% solid epoxy basecoats will begin to yellow or discolor within three years when exposed to direct sunlight.
The most vulnerable area is the first 3 to 5 feet of the garage, where the coating experiences the most UV exposure when the garage door is open. Even with a high-performance topcoat, the basecoat itself will still discolor, creating an uneven and unsightly appearance over time.
The Correct 4-Layer System for Long-Term Durability
At Tru Grit Coatings, we have developed a proven 4-layer system that properly addresses moisture control, UV stability, and long-term adhesion. If you’re considering a garage floor coating project—whether in Florida or elsewhere—you should ensure the company you hire follows a scientifically sound installation process like this:
Step 1: Apply a True Moisture Vapor Barrier (Day 1)
A dedicated MVB primer coat must be installed first, fully sealing the concrete surface.
This ensures no moisture transmission through the floor, eliminating future adhesion issues.
Step 2: Apply a Pigmented Tru-NanoX Poly85 Polyaspartic Basecoat (Day 2)
Once the MVB layer has fully cured, a pigmented NanoX Poly85 Polyaspartic basecoat is applied.
Flakes are broadcast into this coat, not into the MVB layer.
This layer provides superior UV resistance and prevents discoloration.
Step 3: Remove Excess Flakes & Seal with a Tru-NanoX Poly85 Topcoat
After the flake broadcast, excess flakes are scraped away and a final topcoat of NanoX Poly85 is applied.
This locks in the flakes and creates a smooth, durable, and fully UV-stable finish.
Why This Process Matters
Many companies attempt to cut costs by skipping the separate MVB primer or by applying flakes directly into the moisture vapor barrier. While this may seem like a shortcut, it leads to premature failure, discoloration, and moisture-related issues within just a few years.
If your project has experienced moisture issues in the past, it is absolutely critical that you do not settle for a company that tries to shorten the process. A proper 4-layer system ensures:
Complete Moisture Protection – The MVB layer remains fully sealed and functional.
Superior UV Resistance – The pigmented Poly85 basecoat prevents yellowing.
Long-Term Durability – The final topcoat locks everything in place, ensuring a strong, resilient floor.
Final Thoughts: Choose a Company That Understands Chemistry
At Tru Grit Coatings, we are dedicated to science-backed flooring solutions that withstand Florida’s intense UV exposure and high humidity. If you are considering a garage floor coating, make sure the company you choose understands the chemical limitations of epoxy and the proper methods for long-term UV stability.
Cutting corners may save money upfront, but it will cost you in the long run when your floor begins to yellow, fade, or fail prematurely. For a truly long-lasting garage floor, trust a company that understands coatings at a technical level and follows the right process from start to finish.
Contact Tru Grit Coatings today to learn more about our advanced Tru-NanoX Poly85 system!
By James Franklin,
Owner & Technical Development Chemist at Tru Grit Coatings of Florida
Comentarios