Sealcoat is a mixture of emulsified asphalt, mineral fillers, and other additives including water. Sealcoat is applied to the cleaned asphalt surface in two ways: squeegee or mechanical sprayer. Sealcoat is applied for two main reasons protection and beautification.
By sealing your asphalt you are helping to stop the penetration of water on the asphalt surface. Sealcoat also protects the asphalt surface from the sun and harmful chemicals (oil, anti-freeze, etc).
Beautification of your parking lot or street: By sealing your asphalt you will have turned the surface of your pavement black giving it a new-like appearance and possibly adding years of life.