We have a 2003 Four Winds Camper with a 3ft x 3ft "soft spot, where it looks like the wood underneath has rotted away, which make an big indentation in the roofing material. At this point I am afraid ...
OK there is a long thread about this which ended up at this, cut a piece of 1/4 luane plywood tho you'll probably find it called underlayment plywood and is now synthetic to cover the spot. Tape the edges with either Gorilla tape or eternabond, coat the whole thing with Hengs. Give it two coats and use the remainder of the gallon on the rest of the roof.
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