Home - GuardTop- Seal Coat Asphalt Emulsion ,In further efforts to go green, CoolSeal, a light-colored, water-based asphalt emulsion sealcoat is designed to reduce surface temperatures and help mitigate heat …Seal Coat Supply, Inc.Based in Layton, Utah, Seal Coat Supply has been manufacturing the premier asphalt emulsion sealcoat since 1989. Performance, quality, consistency and service of our company and sealer has been, and will remain, our top priority.