Despite it's appearance asphalt is an extremely porous substance, susceptible to damage by rain, sunlight and chemicals such as fuel oil and gasoline. Left unprotected, an asphalt driveway will fade, soften and pit (especially where it is exposed to gasoline and motor oil), and eventually crumble, requiring major repair.
Sealcoating, however, covers the entire asphalt with a flat black coat of coal tar pitch that seals the minute pores in the asphalt surface. As it dries it hardens to form a tough, protective "skin" that keeps your asphalt surface looking clean and new and resists deterioration from sun, rain, gasoline and chemicals.
STOPS OIL, SALT & CHEMICAL DAMAGE
Only coal tar sealer protects asphalt against the highly damaging effects of gas and oil seepage and all other road chemicals, especially alkalins and winter salt.
STOPS WEATHER DAMAGE
Sealing prevents water seepage into the porous asphalt, stopping damage caused by rain, frost, freezing and thawing. Prevents harding and drying caused by oxidation.