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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.

Though they may look similar, tar and bitumen come from different sources. Bitumen is a petroleum product—extracted during crude oil refining—and is mostly made up of hydrocarbons. Tar comes from burning down organic materials like coal or wood. Bitumen is strictly oil-based, while tar is a mix of compounds from natural sources. Both are used as binders in paving; however, bitumen is the standard for today’s asphalt. Tar use has mostly faded out of road construction.

Maintaining a driveway depends on the material your driveway is made of. Concrete and asphalt should be sealed to protect against water and freeze-thaw cycles. Cracks and expansion joints should be filled with a flexible polyurethane caulk or asphalt sealer. Before you apply a sealant to your driveway, consider pressure washing the surface. It will take off any loose sealant and any grime that might have caused a stain. Sealing over dirt and stains will trap it under the sealer.

If you live in colder climates, consider using sand rather than salt to de-ice. Sand helps melt the snow and ice without speeding up the freezing and unthawing process of your driveway, which helps prevent cracks from forming from the constant fluctuation of temperatures.

Oil can permanently stain a concrete driveway if it fully dries or sits for weeks without cleaning. Concrete is porous and absorbs the oil deeper over time. That’s why it’s best to remove an oil stain when it’s wet by applying an absorbent material, sweeping the area, applying dish soap, scrubbing, and then rinsing.