hey guys, im working on an e-body replacing the cowl and firewall.......the factory has a sort of foam/sealer in the pinch weld.....i was wondering how you guys seal these seams.......basically, i want to avoid water from getting to the plug welds along the bottom of the upper cowl where it meets the firewall......this is a difficult area to access from inside the cowl after installed.....i want to avoid rust stains from bleeding out of the seam and running down the firewall.....anyone have a trick for this? thanks!