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What is the best way to prep for use over Dicor's 501LSW lap sealant around vents, skylights etc.?

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RV has multiple vents and they were sealed with Dicor's 501 lap sealant.  I just purchased 7 gallons of RV liquid roof and I want the material to be compatible and not come up around these vents.  So far I've gotten three answers that conflict.
asked Oct 31, 2016 in Technical by Bill

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Hello The Dicor Lap Sealant contains some solvent so it is not good for filling such a void.

A better method is to fill cavity with spray insulation foam;  seal the end with Butyl Tape and coat over Tape with Liquid Roof.  A Universal Repair Kit has everything needed except the foam.
answered Oct 31, 2016 by admin
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