Liquid Roof is a Liquid EPDM roof coating manufactured by Pro Guard Coatings. It covers 42 - 46 Sq. Ft. per gallon. It is designed to go over EPDM Rubber RV Roofs with the exception of Alpha Rubber. Alpha Rubber requires a primer. Liquid Roof will also work over many other types of RV Roofs. Just give us a call and we are happy to help.