Also, I looked at the roof issue more closely last night. It seems the "thin layer of wood" separating the fiberglass exterior walls or separating the epdm roof from the wood is what has decayed. At least in the shower skylight case, the wood was still firm and did not give way when I pushed on it with the drill bit on my drill. So, replacing the EPDM entirely would be overkill I think.
Reason why I want to coat the whole roof.... there are too many repair variables (spots) in play. It would be a lot less to worry about in the coming couple of years, if we could just coat over it again. I'm not up for a full EPDM removal project and I don't have a good place to do it at either. I realize if I use the Henry 887HS product that I will be stuck using that alone from this point forward (because the product literature does state it bonds to itself for future needs), but it doesn't bother me because I don't feel like we'll have this camper more than 10 more years, at which time I'll just pass along the info to the next owner.
I've spoken to Henry manufacturing on the phone and I'm going to trust the vendor and their lifetime warranty and just see how it goes.. I mean after all it does get 5 stars on Home Depot's site (unless all those reviews are fake)... and I will actually report back on here from time to time to let others know how it works out.
