Interlaminary Polyurethane Primer is a single component primer used to promote the adhesion of new polyurethane coatings to existing, fully cured polyurethane coatings. CCW-554 Interlaminary Primer bonds with the existing polyurethane compound, providing a receptive surface for a new waterproofing system or top coat. When coating over existing epoxy coatings, use CCW-557 Epoxy Primer.