Kwik Fill Polyester Primer Surfacer is a catalyzed primer surfacer that offers excellent fill and build capabilities. It can provide one-coat coverage for many applications. Its fast drying and easy sanding features make it the ideal primer for every day use. Kwik Fill’s chemical cross-link cure provides excellent sealing and holdout properties when used over body filler repair areas. It has excellent adhesion to a wide range of substrates including metal, galvanized metal, fiberglass, SMC, aluminum, body fillers and polyester glazing putties, and over properly prepared old finishes.