Prime-Tek Acrylic General Purpose primer is a single-component, water-based, multi-use acrylic primer used to prepare substrates for the application of elastomeric coatings and sprayed polyurethane foam (SPF). This material is black in color, can be sprayed, rolled, or brushed, and provides excellent adhesion to most surfaces. It has been specially formulated to maximize adhesion to a variety of substrates, including BUR, modifi ed bitumen, wood, metal, concrete (minimum 30-day cure), polyurethane foam, and masonry. This product can be used to "hold," or temporarily protect, SPF from UV radiation.