Sealcoating Saves You Money! Research has demonstrated that properly applied sealcoat can save the owner of a property $50,000 or more over the life of a hot mix asphalt pavement. But what does seal-coat actually do that results in this substantial savings? Why seal asphalt? Seal Asphalt to have a nice slate black color giving it protection and a nice clean look. Seal Asphalt!It is an effective solution for Driveways, Parking Areas, Streets, Highways and Anything Asphalt. Asphalt is a petroleum based product. It is very flexible when it is first laid. As time passes, the petroleum based products (Tar & Bitumen) get oxidized and Dry out by the sun. The asphalt becomes brittle when the surface color turns Grey. It now has lost its flexibility and is going to Crack. Cracks then lead to Spider cracks looking like alligator skin. Cracks then lead to Holes and deteriorated areas. Then leading to asphalt replacement... and this is why it is so important to seal asphalt.