Originally Posted by Senior Chief
Silicone is a very poor exterior sealant. VERY difficult to remove completely and about the only thing Eternabond won't stick to.
Silicone has its place but its not on a roof.
At one point in time this was true.
I owned a sealant compounding plant. New technology enabled us to compound a silicone rubber that has excellent adhesion to fiberglass, wood, metal and many other surfaces. It;s impervious to UV. The temperature range is -60 to +350. Elongation, or stretch factor, is 200+. It is designed for exterior adhesion and watertight sealing. You wouldn't recognize the odor. It's an oxime cure.
Unfortunately the only silicone rubber you can purchase in a hardware store is an acid cure bathroom sealant.