I just bought a Trail Lite B+ 211s with 8.1 Chevy engine. This is my fifth motorhome (others range from an old 20' Vagabond, and three Winnegagos, from 19 to 32'. This vehicle is fantastic. I am...
Burl, google Phred's Poop Sheets and start reading about RV care and repair! :)
Putty tape is what RV builders use under all the things that are screwed to the sides and roofs of RVs. Then in most cases they caulk over the outer junctions of same objects. It is a belt and suspenders system but they both can fail.
Pet, they now have about 3 varieties. The advanced ones are more butyl rubber based versus the older gray stuff which is probably what your neighbor developed.