TREMprime WB is a water based polymer modified asphalt primer formulated from refined select asphalt, special adhesion promoters and synthetic polymers which conditions a variety of roofing substrates prior to the application of Tremco Roofing Systems and coatings. TREMprime WB is asbestos free, easy to use, and is low in volatile organic compounds. TREMprime WB Primer is a high-solids, water-based primer for use in preparing porous and non-porous surfaces for application of TREMproof 6100, 6100BM and 6145. It can be applied with a roller or airless spray equipment.