Originally Posted by perryg114
I 2cnd the Vulkem. That perma gum tape will dry out and crack over time. That tape is why so many SOB trailers leak like a sieve. It works if it is always under compression but it flows so it does not stay under compression for long.
Sorry for you Vulkem fans, but that IS NOT the preferred sealant, as specified by both RV water heater manufacturers; Atwood and Suburban. You should not permanently seal that unit to your sidewall with a polyurethane adhesive
, just in case you have to remove it at some point down the road.
And proper use of butyl tape
will not leak and IT DOES NOT DRY OUT OR CRACK. Putty tape does, but butyl tape does not. I have replaced water heaters on lots of older units, and the butyl tape seal was as good as when it was installed.
Do it right
, do it once
and use the proper materials
, not some home grown remedy.