DO NOT USE THE SILICONE, IF YOU DID, TAKE IT OFF!
Couple of years ago I bought an 85 Wilderness that I knew had major water damage in 3 corners. The corner studs had been reduced to sawdust. Strangely enuff very little of the water damage was visible inside and not at all on outside. the culprit was silicone seal. The previous owners had put silicone over the original caulking. All it did was separate from the old caulking and from the original aluminum siding and was actually trapping and holding water and sending it inside the trailer. After rebuilding the corners I caulked the whole trailer with Pro-flex. No more leaks.
Years ago I had cut a sunroof into my '65 Chevy Van tow vehicle. After many years it started leaking so I ran silicone caulk around it. It kept leaking and I again discovered that it had pulled away from the sunroof frame and was trapping water and sending it directly into the van. Used Sikaflex 221 (better than Pro-Flex) this time, no more leak.
(I agree that Dicor is a good product and should be used rather than silicone).
