Cetguard W22 Primer is a high performance thixotropic poly methyl-methacrylate (PMMA) two-component, rapid-curing, resin primer. Cetguard W22 Primer is a flexible primer used as a sealer for concrete, masonry, wood, asphalt and other substrate. Cetguard promotes adhesion and reduces staining that can occur on applications over existing builtup roofing and asphalt residue.