RV sealant by roof type
The roof material decides what will bond. Here is what each manufacturer says its product works on, and where it says not to use it.
EPDM (rubber) roofs
Use a lap sealant rated for EPDM around edges, vents and screw heads: Dicor's self-leveling (501LS) and non-sag (551LS) lap sealants both list EPDM. For seams and tears, EternaBond RoofSeal tape lists EPDM. For a full recoat, Tough Tech lists EPDM rubber for Tough Roof RV.
Avoid on EPDM (per the makers): Geocel Pro Flex RV and Sashco Through the Roof! Both say not to use them on EPDM rubber membranes.
TPO roofs
Dicor lists TPO as compatible with both its self-leveling and non-sag lap sealants and with its gunnable butyl sealant. EternaBond RoofSeal and Tough Roof RV also list TPO.
Avoid on TPO (per the maker): Geocel says not to use Pro Flex RV on TPO.
Fiberglass roofs and caps
Geocel Pro Flex RV is made for fiberglass, aluminum, wood and vinyl joints, so it suits fiberglass caps, trim and moldings. Dicor lap sealants also adhere to fiberglass, and EternaBond lists fiberglass for seam repairs.
Aluminum and metal roofs
Sashco lists metal RV roofs, flashing, vent pipes and skylights for Through the Roof!, and says it sticks to wet surfaces. Geocel Pro Flex RV and Dicor lap sealants both list aluminum. EternaBond lists aluminum and galvanized steel.
Not sure which roof you have?
- Check your owner's manual or the RV manufacturer's spec sheet for your model year.
- Look for a roof label near the ladder or roof edge; many RVs have one.
- Ask your RV dealer or service center with your VIN.
We don't recommend guessing from color alone. White EPDM and white TPO can look similar.