Re: WOW ... stop the rust while you can ...
Ok guy's this is going to be a long one so here it goes:
Way back in this exact thread I also thought the gaps at the front and rear of the weatherstripping retainer / holder was the reason the water was getting behind the stripping. So back then i did seal up those gaps with some industrial strength Black tape. There was no way the water could enter in there through those gaps.....Guess what, the water still got behind the stripping. So I believe its best to leave those gaps unsealed, so the water can get out, and the air can circulate.
Next, I do believe that the water is coming from the top of the doors and going down and behind the weather stripping. I still have not found a fix to this. There was a post from a gentleman from England who posted this is indeed where the water is getting in there, and he tried to explain how to seal up the place where it leaks. But I couldn't follow his fix.
Next, I did scrape out the rust that was there and treated the area with the por 15, it seemed to work. But time will tell.
Lastely, when ever my car does get rained on, or I wash my car, I always remove that damn weatherstripping, and I use an air comperssor to dry out the area, the outside of the weather stripping, and DO NOT forget to dry out the inside of the weatherstripping. The only way i've found to do this, is to insert the nozzle of my air compressor into the holes of the weatherstripping and blow out the water. This is a major pain in the ***, but it keeps the area dry. And without moisture no rust can form.
Hope this helps.