Pavement Sealer
In Business Since 1949Senior and Military DiscountsAll Work Guaranteed for 2 Years
GemSeal® Black Diamond™ Pavement Sealer
GemSeal Black Diamond pavement sealer is a new, high-performance alternative to asphalt emulsion (AE) sealers. With all the environmental benefits of AE sealers, Black Diamond exceeds AE performance by providing better coverage, greater durability and superior color stability. Black Diamond also provides performance similar to refined tar sealers through the ease of application and toughness against power steering marks.
Finally, like all GemSeal pavement sealers, the professionals at T. Townsley Seal Coating & Repairs make Black Diamond with our precision colloid mill system, giving you a product that will always be consistent to save time on the job.

Benefits to Black Diamond Sealer
- Fuel Resistance - resists gasoline and oil penetration comparable to refined tar sealers
- Easy to apply - applies as smoothly as refined tar sealers
- Color stable - eliminates bluing or graying issues common in AE sealers
- Burn free - crews will love to work with it!
- Tougher - resists power steering marks better than AE sealers
- Economical - higher dilution rate than AE sealers, reduces cost per gallon
- Temperature friendly - can be applied in lower temperatures than AE sealers
- Durable - longer lasting than AE sealers
- Consistent - colloid mill process takes the mystery out of mix design

The Product's Specifications
Meets the following standards listed below:
• ASTM D 140 • ASTM D 529 • ASTM D 466 • ASTM D 2939
GemSeal Black Diamond does not contain refined coal tar but does not meet the performance standards listed in:
• ASTM D 5727 • ASTM D3423 • ASTM D490 • FAA P-625; and P-630

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