Sealcoating is an important preventative measure for maintaining your asphalt. Sealers consist of emulsions that combine asphalt or refined coal tar with clay, mineral fillers and water. Sealer provides a sleek, black protective layer over the asphalt. This creates a barrier against water and other stresses and increases the longevity of your asphalt.
Resurfacing is not a regular preventative treatment but rather remedial maintenance that becomes necessary when asphalt experiences severe deterioration. If asphalt is very old or has not been regularly sealed, it may require resurfacing. This process involves ensuring that the asphalt base is sound, cleaning and filling the existing pavement and then placing a new layer of asphalt over that existing layer. For more detail be sure to reference this blog post.