#990 Eternalastic EPDM Primer is a rinse-able low viscosity, sprayable liquid used as a pre-treatment of black EPDM rubber roof and Single-Ply membrane prior to power washing and application of Eternalastic coating. The unique chemistry is designed for use with Eternalastic Coating. Pre-treatment with #990 Eternalastic EPDM Primer significantly improves the adhesion of Eternalastic to a EPDM rubber.