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Hot-pour sealants have an asphalt cement base that might also include rubber and other materials to allow the seal to flex in hot or cold temperatures. Asphalt emulsion sealants are not heated but are liquid applications that use water and an emulsifying agent to allow the asphalt and water to mix.

Instead of a set number of types, asphalt comes in variations designed for different needs. Some are categorized by temperature—hot mix, warm mix, and cold mix. Others are sorted by composition, like dense-graded, gap-graded (such as Stone Matrix Asphalt), porous, and mastic asphalt. There are also modified versions with added compounds like polymers, rubber, or emulsions. Instead of focusing on a number, it may be more useful to understand how contractors customize asphalt for durability, climate, and traffic conditions.

You should always power wash your driveway before applying a sealant. At any given time, your driveway could be covered with algae and moss, tire residue, oil and rust stains, and any combination of leaves, twigs, and dirt. If you skip power washing, you’ll be trapping the dirt and grime beneath the sealant and lowering its chance of cementing itself to your driveway. While you can expect the cost to pressure wash your driveway to average between $100 and $350, the few hundred dollars beats an unattractive driveway or paying extra to reapply your driveway sealer.

If you don’t want to seal the entire driveway using a squeegee, you can use a roller instead. Rolling the driveway sealer also provides an even, sufficient coating, although it might require more skills to control the speed and pressure. We don’t recommend spraying the driveway sealer because it would cause more splash, hence wasting more material. If anything, you may spray the sealant and go over the surface again with a squeegee to ensure proper coating.