Take a close look at the entire surface where you plan to apply the sealant. Look for big, noticeable stains or places where there is substantial damage, such as chipping or flaking.
Address any areas with serious damage by removing or replacing them. Clean up any significant stains using household cleansers or a product designed specifically for cleaning concrete or asphalt. Be sure the surface is completely dry before you proceed to step 3.
Apply the sealant using a brush, roller or sprayer. Try to apply an even coat over the entire surface, even where changes in texture and porosity require thinner or thicker coverage.
Using a cloth or sponge, wipe up any excess sealant that doesn’t soak into the surface after several minutes.
Let the sealant dry for at least two hours, and then evaluate the coverage. If desired, you can apply a second coat at this point for additional protection or a higher-gloss finish.