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Sealing between overlapping metal

Weld thru primer, yeah I know. I also think I know that it was meant for real spot welds, not plug welds, and that it burns off near the weld.

So... what about a capillary action? The idea occurred to me the other day when I was soldering some copper fittings on to copper pipe. Why cant I do that with metal? Not necessarily soldering, but with some sort of coating or plastic resin or ???

Anyone ever tried this?
They used to use lead and bronze or brass on alot of joints. Lead between roof and quarter panels, brass on the radius' at the corners of window openings. Now, instead of using Lead, that they know is harmful to people, they have these chemical formulas that get hard and are considered safe, probably because there is no history of how harmful the chemicals are to people. Think of replacing God given sugar with high fructose corn syrup. Or companies making billions with vaping as people do not realize they are sucking in the chemical nicotine that cigarette companies got creamed for because they were adding it to cigarettes to get people addicted.

Whatever is left, whether it was weld thru primer or epoxy is more protection that would be there if nothing was used. I have considered completely welding lower quarters to rockers, but you lose the line that is there because of the fender and it looks wrong if it were filled up.


Trying to be the best me, I can be
Weld thru primer is crap. If you are plug welding the best way to do it is to coat both flanges with SPI epoxy. After they have cured, you've drilled or punched your holes and are ready to weld, just scratch away the epoxy on the inside of each plugweld hole. After you have welded and finished your panel just spray 2-3 coats of epoxy like you normally would, making sure to get complete coverage on the front and backside of the flange (plugwelds). That's all you need to do. You will not have any issues with rust for a long time if you do it like that. Sealed with epoxy rust will not form from the inside out. Follow that up with caivity wax on the inside of the rockers,inner doors, wherever and you have excellent protection.