Apollo Roofing RoofPrime Fast-Drying PVC Primer is a fast-drying PVC primer based on solvent-based polyurethane. It is specifically designed to improve the adhesion between PVC membranes and liquid roofing systems, promoting the longevity of the roof. This primer is easy to apply using a brush or roller. It is used for improving the adhesion properties between PVC-based membranes and liquid roof coatings in liquid-applied membrane systems.