Dicor Lap Sealant is a self-leveling sealant in a 10.3 oz tube for sealing RV roof vents, vent pipes, plumbing stacks and screw heads. It bonds to EPDM, TPO, fiberglass and metal roofs and stays flexible so the seal moves with the roof instead of cracking. RV owners use it for vent and fan installs, usually over butyl tape under the vent base. It is the standard choice for this job; the main trade-off is that it skins over slowly and can sag on steep curves.
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RV owners rate Dicor as the go-to lap sealant for vent and fan installs, praising its adhesion and long-term flexibility. Complaints center on the runny consistency on slopes and the slow cure.
This lap sealant helps create a watertight seal along a roof's edges, air vents, vent pipes and screw heads. It is used when installing or replacing RV roof vents, such as a Fan-Tastic Fan or Maxxair MaxxFan. It also works for side mount vents, plumbing stacks and refrigerator vents on a camper van or motorhome.
Apply the sealant on top of the roof vent exterior assembly. Butyl tape is also needed to line the edges under the base of the assembly.
The sealant is formulated for EPDM roofing and is compatible with most other roofing materials, including fiberglass and TPO. It bonds well to aluminum, vinyl and galvanized metal. It keeps sealing and stays flexible. It is UV-stabilized to prevent discoloration and deterioration.
