How to Seal a Blacktop Street

Thoroughly clean any pothole. Provide key in pothole by undercutting the edges of the pothole, and overfill with patch material. Add patch material in 2 inch lifts, and tamp. Fill patch material roughly 1/4 inch above the existing surface, and tamp. Install gravel to within 4 inches from the top of the pothole for any deep potholes, and tamp before continuing to install patch material.

Remove any weeds and roots. Sweep the area thoroughly. Apply degreaser to remove any oil or grease or use a stiff brush to scrub and remove any stains. Power wash the surface. Wait at least 48 hours after any repairs have been made to the blacktop prior to application of any sealant.

Select appropriate mix design for sealant according to low, moderate or heavy traffic patterns and add special additives, such as sand for traction, as desired to sealant. Apply a thin coat of sealant with sealant applicator (squeegee for smaller areas or sprayers for larger areas). Use a stiff brush to ensure sealant is distributed into the surface and any crevices. Ensure coverage of sealant extends to and over the edges of the asphalt.

A second coat of sealant can be applied when the initial coat is dry. Allow the second coat to dry for 24 hours. Always follow manufacturer's recommendations on label for best results and for curing times.