3M 5200 Marine Sealant et al
I currently go over my camper religiously looking for chances of leakage at least every six months. Seams on the roof, windows, etc. are checked for any signs of cracked sealant or separation. I treat...
Forum Discussion
theoldwizard1 wrote:
Butyl is best used where the window is held in place by other mechanical means and can be removed so that the butyl can be replaced. If it is oozing out, the item was clamped too tightly.
Butyl will ooze out due to movement and temperature change. It will continue to do so for years. On a boat I had it continued at age 15. Yes it can be removed and replaced. Buy why would I want to do that every few years? A LOT of experience with both materials has me using PU or PE sealants as I only want to do things once, not again and again. It isn't forever, but an expectation of 15 - 20 years isn't unreasonable.
Butyl does work. Silicone does work. Marine PU or PE works much better, for much longer. Butyl and silicone are used in RVs because it is quicker, and cheaper.
