Fiberglass in the drip rail

[Cmillet]

I've read every post on "roof" "drip rail" "fiberglass" etc... And can't find anything about putting fiberglass in the drip rail. Can someone tell me why I should not? I am repairing the inner roof and can see daylight coming inn from the drip rail. (After I cut away some of the inner roof.) some of these are pin holes but some are just daylight between the sandwiched outer roof and windshield frame. Just thought I could use fiberglass to seal this off. Your thoughts???

[68shortwide]

I wouldn't but that's just me, I'm not a body men but to me it would just give rust a great place to start, id weld the pinholes and just repaint the affected areas

[Fitz]

Originally Posted by Cmillet

I've read every post on "roof" "drip rail" "fiberglass" etc... And can't find anything about putting fiberglass in the drip rail. Can someone tell me why I should not? I am repairing the inner roof and can see daylight coming inn from the drip rail. (After I cut away some of the inner roof.) some of these are pin holes but some are just daylight between the sandwiched outer roof and windshield frame. Just thought I could use fiberglass to seal this off. Your thoughts???

Fiberglass will crack as the roof expands and contracts in the sun allowing the seam to open. The factory used a flexible seam sealer to keep the seam from opening and letting rain in when the metal moves. Glassing that joint in is just begging for a rust problem. I hope you know how to weld because that's the only way to fix the problem you have now. If you don't or you don't have a welder check with your local community college or any high school that has an automotive program. Chances are you can get the instructor to use your truck as a "teaching project".