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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.

Asphalt driveway sealer lasts approximately one to three years. Although the industry standard is to add fresh sealant every two years, this ultimately depends on where you live. Your driveway is subjected to elements like harsh sunlight, freezing temperatures, precipitation, and extra wear and tear that comes from foot traffic and heavy cars. If you start noticing small cracks or uneven drying on your driveway, it’s a sign that your previous seal coat has run its course and your driveway needs a new one.

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.

DIY sealants exist, but professional application ensures uniform coverage and long-term durability.