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Ziollo RV Roof Lap Sealant is a self-leveling silicone sealant sold in tubes for sealing roof laps, seams and around vents, skylights and antennas on RVs and trailers. It flows out to a smooth, flexible, waterproof bead that stays put on horizontal surfaces and tolerates the movement and weather an RV roof sees. It suits owners doing their own roof maintenance who want a straightforward caulk-gun product rather than a tape or a two-part coating. Against Dicor and other RV lap sealants it is a comparable self-leveling option, though it is not meant for vertical surfaces and needs a clean, dry roof to bond well.
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Lowest price we've seen: $10.95 on Nov 9 at Amazon. Tracked across 2 stores since Nov 9.
Owners who use it for RV roof seams and around vents report it flows out evenly and seals well when the roof is prepped. Complaints center on runs on sloped areas and on adhesion when the surface was not cleaned properly.
