You are cheap.:roll: Otherwise, you would hire a comprehension coach:D

I merely stated that the sealant that the RV store sells as vibaration resistant is likely a marked up version of the HD stuff. There is nothing about my purchase intent.:roll:

Maybe you should have Caroline check your work before you post it... :roll:

You guys have your heads up your butts with this 'designed for vibration' nonsense.

Any good urethane or silicone sealant is designed to accomodate cyclical movement. Class 25 accomodates 25% joint movement, Class 50 accomodates 50%, etc. Stuff made for roofs of RVs are typically membranes and not joint sealants. The talk of RV roofs just confuses the issue.

As Dr. K would say, sheesh...

Marine clean is the best prep cleaner I ever ran across. You could also use great stuff expanding foam to fill any voids,trim up and do a final cover up with a paint-able silicone.

tape the seam with helicopter tape and be done with it.

http://www.amazon.com/ISC-Racerstape.../dp/B000TPC7HU