It's likely to be a rubber roof. You can do the fingernail test press your FN on to the roof and it should leave a indention or you should feel some give, if I were doing the tape I would put it down first then finish with the coating some might do it another way but that my way I run it
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Mark Anderson - Nebo NC - western NC - RV Restoration tech - 9 Doggies - Outdoors person
1990 33ft Wilderness Cimarron 33X
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