Got a headliner problem, Mid 80s boat with the vinyl, foam backed.. In the sea-berths, galley, nav-station, forward and the heads, the vinyl is drooping. I've pulled the vinyl headliner out of the forward room, seems the foam backing has fallen apart letting it droop.. Tried to fix it in the head and where it did stick with 3M adheaseve, it looks like crap.. I do all work on my own boat but this has me wondering...how do I fix it...any ideas...