CAV-PRIME Sure-Seal EPDM HP-250 Primer is Carlisle's HP-250 Primer packaged in a pressurized cylinder for spray application. HP-250 Primer is a solvent-based product designed for one-step cleaning and priming of EPDM surfaces prior to the application of SecurTAPE™, Factory-Applied Tape™ (FAT), and all other pressure-sensitive (PS) products.