There are various types of RV roofs now being used: Rubber (EPDM), PVC and multiple formulations of TPO. Care must be taken to make sure that the roof sealant used, is compatible with your exact type of RV roofing membrane. To help alleviate that problem, LaSalle Bristol now offers the XTRM Universal RV roof sealant that can be used on all RV roofs without the need of a primer.