SA Nail Base is manufactured with a polyolefin top surfacing, which provides a smooth surface to obtain optimal adhesion between the base and the cap membrane. SA Cap is a premium SBS modified bitumen membrane, reinforced with either a polyester or fiberglass mat. It is manufactured with a premium High Tack formulation to allow application in cooler climates. This is ideal for areas where it is not feasible to use hot asphalt, cold adhesive and torch application.