Sealcoat is a mixture of emulsified asphalt, water, mineral fillers, and various other mixtures. Sealcoats are applied directly to the surface of an asphalt pavement. It can be applied by rubber squeegee, broom, or mechanical spray.
Sealcoat serves to seal the top of the asphalt, preventing water from penetrating the surface of the pavement and protecting the top layer of asphalt from oxidation and wear caused by exposure to the sun and air. Sealcoat also beautifies the pavement by providing a smooth, black, and even surface ideal for painting lines and sweeping.

Sealcoat is designed for off highway use where there are low traffic speeds and tight turning radiuses such as parking lots, mobile home parks, schools, shoulders, etc. Sealcoats are different from slurry seals which use a much coarser aggregate filler and are designed for use on high speed areas with straight rolling traffic.