Duratec Gray Surfacing Primer is a premium polyester primer known for its superior filling and leveling capabilities. It provides excellent adhesion to a wide range of materials including fiberglass, metal, wood, pressboard, brick, concrete, and various foams. Engineered for quick build-up, this primer sands smoothly and can be polished to a high gloss, making it ideal for creating plugs or mold coatings. Shelf Life 3 months