My rear side glass pieces were leaking, so i pulled them off and cleaned up the area. Turns out they are still leaking. First i tried butyl tape which didnt work very well at all, after cleaning up that i tried Proflex RV sealant and Buytl caulking on the other side. I cut a 2x4 to keep pressure on the windows for two days. Now i went to wash the car and they are still leaking! this is extremely annoying, is there a better product? All i do is apply a 1/2" bead all the way around the edges of the glass and stick it on, am i missing anything? My last resort short of pulling everything off and trying a again is a bead of clear RV proflex between the bottom louver and the glass. This would prevent any water from passing this seal since its leaking at the bottom. its a really poor design since everything needs to be sealed from the inside, the louvers have to go on the same time the glass is applied from the inside.