Biggyniner wrote:
While it is true they often leak, a lot of it stems from poor owner maintenance or poor initial build quality. I check my seals twice a year and reseal around the marker lights / front window every 2 or 3 years. My 1994 Minnie has never (knock on wood) leaked and I rarely cover it (We tend to use it year-round). Just wash it, keep it clean, and reseal when needed.
Also important is using the proper sealant. On mine I need to use 311 sealant, it is what they used from the factory. Dicor will not stick to this silicone based sealant. Some people use plain silicone, or just an incompatible sealant with what is currently on their RV. Then they forget about it and it leaks...
You are right, the type of sealant is critical. All RV's will leak sooner or later. I'm vigilant about keeping my 5th wheel sealed. I've also found that 3M 5200 Marine caulk is very very good. It adheres to fiberglass and stays rather soft to allow flexing. Good below waterline on boats so you know it's good. They make two different types with one being a "quick setting" formula. I usually use the slow setting formula. Silicone is worthless in some applications although it stays sealed on glass!!! I've sealed leaks on auto glass, boat windshields and camper windows with it. It remains water tight.
But some surfaces it will not stick....like the outside wall on an RV
