The self-leveling Dicor lap sealant is pretty much the industry standard for roof applications. For all other caulking I use THIS polyurethane sealant. Comes in many colors and the gray matches our Big Country really well!
For clarity, Dicor is the name of one company that provides the membrane material for EPDM roofs, product for sealing such roofs (such as lap sealant), and other stuff. They also have multiple companies that provide additional products for RVs.
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