Karnak #198 Asphalt Roof Restaurant is a carefully prepared blend of selected asphalt, mineral fillers and selected penetrating oils. These penetrating oils soak into the existing roof mat to help rejuvenate the old asphalt. Further more, a thick layer of asphalt remains on the surface of the roof to protect it from the ultra-violet rays of the sun as well as serving as a binder for the replacement of the gravel or slag.