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Dicor 501LST-1 is a self-leveling lap sealant for RV roofs, sold in a 10.3 oz tube. It flows out to a smooth, flat bead on horizontal surfaces, so it seals seams, vents and edges without tooling. It is sun-stabilized and made not to stain EPDM, TPO or PVC membranes, and it bonds to aluminum, wood, fiberglass, galvanized metal, vinyl, mortar and concrete. It is the standard choice for sealing RV roof seams and the fittings around them; the main trade-off is that it only self-levels on flat surfaces and is not meant for vertical or overhead work.
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Lowest price we've seen: $10.50 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
RV owners treat Dicor self-leveling lap sealant as the go-to for roof seams and fittings. They report it flows out flat, bonds well to EPDM and TPO, and holds up through sun and weather. The common complaints are that it runs on slopes and that a tube does not go far on long seams.
Dicor 501LST-1 is a HAPS-free, self-leveling lap sealant for RV roofs. It is sun-ray stabilized to resist wear and discoloration. It will not stain or discolor the roofing material it is applied to.
The self-leveling formula spreads smoothly on horizontal surfaces. It works on EPDM, TPO and PVC membranes. It also adheres firmly to aluminum, mortar, wood, vinyl, galvanized metal, fiberglass and concrete. The sealant is tan.
