DuPont StraightFlash VF (Versatile Flange) is an innovative, dual-sided butyl, self-adhered window and door flashing. DuPont StraightFlash VF (Versatile Flange) is specifically designed to help keep wind-driven rain from entering around non-flanged and brick mold windows and doors in brick facades. Engineered to keep water out around non-flanged and brick mold windows and doors in brick facades or molding. Nine months UV resistance.