QR Extreme permanently repairs ALL RV roofing materials including EPDM TPO metal and Fiberglass. It needs no primer can be adhered down to 25°F and can be installed when wet and in some cases even while submerged under water. It s clear less gooey Steel-Loc Adhesive in conjunction with its easy-release paper backing make for an easier installation. Permanently repairs: EPDM TPO Metal Fiberglass Aged & Rigid PVC Vinyl Wood OSB and most building materials.