Liquid Roof RV Roof Repair Coating Liquid EPDM. Liquid Roof is the only RV Roof Repair that is a Liquid EPDM coating to quickly and permanently repair your RV Roof. Liquid Roof, Liquid EPDM rubber coating: Now you too can enjoy the many benefits of a weather-tight rubber roof. Liquid Roof forms a 100% chemically-cured seamless membrane every bit as solid and attractive as factory installed sheet rubber. And you can install an entire new rubber roof yourself, or make repairs to your existing roof, quickly and easily. Liquid Roof's simple one-coat application by brush or roller saves you time and money, sealing and protecting your RV from water damage and fuel guzzling drafts. No other product can match the durability of EPDM Rubber.