QR Extreme permanently repairs ALL RV roofing materials including EPDM TPO metal and Fiberglass. It needs no primer can be adhered down to 25AdegF 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.