When it comes to sealcoating, the common belief that “thicker is better” simply doesn’t hold up. Applying a thick coat of sealer may seem like a good idea, but it often leads to uneven curing, surface cracks, graying, and premature failure. Instead of enhancing durability, overly thick sealer can reduce the lifespan of your sealcoating project.
What Makes Sealer Thick?
Thick sealer viscosity can result from a variety of methods, but many of them harm the quality and longevity of the sealcoat. Some manufacturers use shortcuts such as:
- Lowering pH levels
- Adding vinegar
- Using modifiers or thickening agents
- Incorporating bentonite clay
Bentonite clay, in particular, artificially thickens the sealer by swelling up. While this creates the appearance of a thicker product, it reduces the amount of binder—the most critical and costly component of sealer. Binder ensures proper adhesion and strength, and a low binder-to-filler ratio weakens the sealer. High ash content, a marker of excessive filler, results in a brittle, gray finish prone to early degradation.
Why Binder Matters
Binder is what holds the sealer together and allows it to adhere effectively to asphalt surfaces. When manufacturers prioritize cheap thickening methods over binder quality, the sealer becomes less durable and less effective. A proper balance of binder and filler ensures the sealer withstands traffic, weather, and time.
Quality You Can Trust
At Asphalt Sealcoating Supply Inc., we believe in delivering products made the right way. Our sealers avoid harmful additives and maintain the ideal ash content—approximately 38%—to ensure strength, flexibility, and long-lasting performance.
Don’t fall into the “thicker is better” trap. Choose a supplier committed to quality and transparency. For reliable products that stand the test of time, call Asphalt Sealcoating Supply Inc. at 304-916-6117. We’re here to support your sealcoating success.