Saving quarter panels

Nice!

I thought about the same basic idea but using rust converter liquid.
And plugging the drain holes for a while and hopefully you see some seep out of the seams.

I have a number of doors on my 96 Jeep Grand Cherokee with rust at the lower seam. I have not tried it yet.

I did a similar thing with some por 15 like paint and a fender to get it into the inside areas after chemical dipping.