One of the first things I put POR-15 on a few months back when I started my restoration was the hood hinges. Talk about looking brand spanking new. I was proud how they turned out. Well Friday evening my painter was bolting the hood on to align the front body panels and tried to shut the hood and it would not shut. No damage done to the hood thank god! But the POR-15 had pretty much dried so hard it welded the hinge in the "open" position. After removing the hinge he beat the hell out of it with a sledge and was able to eventually get it to free up. The POR-15 didnt chip and wouldnt break though! Its some pretty damn durable stuff. Now my plan is to actually take him 2 more painted hinges and not use the ones with POR-15 on them!