Walk into any hardware store and you'll see shelves of driveway sealer. Most of it falls into two families: coal tar and asphalt emulsion. They look similar going on, but they behave differently once they're on your driveway.
What is coal tar sealer?
Coal tar sealer is made from a by-product of processing coal. It has been used on driveways and parking lots for decades because it resists gasoline, oil and other automotive fluids well, and it holds up to UV exposure.
What is asphalt emulsion sealer?
Asphalt emulsion sealer is made from asphalt cement mixed with water. It's common in store-bought buckets and is easy for DIY use. Because it's made from petroleum, it can be softened by gas and oil drips.
Side-by-side
- Fuel and oil resistance — coal tar generally performs better
- UV resistance — coal tar tends to hold its dark color longer
- Ease of DIY use — asphalt emulsion is more widely sold for homeowners
- Smell during application — coal tar has a stronger odor while it cures
Why we use coal tar — and hand-brush it
At Henne Sealcoating we use a coal tar product and apply it by hand with brushes. Brushing pushes the sealer into the pores and texture of the asphalt for a thorough, even coat. For driveways and lots that see car traffic, oil drips and Berks County winters, that combination gives a durable finish.
Local rules worth knowing
Some states and municipalities restrict coal tar sealers. If you have questions about what's allowed on your property, ask us during your free estimate.
Common questions
Is coal tar sealer better than asphalt sealer?
Coal tar generally holds up better against oil, gasoline and sun. Asphalt emulsion is easier to find for DIY use. We use coal tar for its durability.
Does Henne Sealcoating spray or brush?
We do all hand-brushed work, which works the sealer into the surface for better coverage.