MJM
Promoted Users
No choice but to use filler in there. It's welded from inside. The lumps outside are penetration nuggets coming thru, so super solid. Cannot weld the outside, the quarte panel will warp to heck. A friend mentioned UPOL fiberglass filler which can span gaps. No real gap though, solid connection, so should be fine. Some minor sculpting on the inside corner.
UPOL
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Now there's two solid pieces of information. I find it very interesting you welded it from the backside. I've often thought about doing that on body panel patches where I have good access to the backside because, as you've already stated, when it provides good penetration with a small weld nugget on the viewing side of the panel. Obviously it would also make for a quicker weld dress. Your reply has opened up another way of welding a panel, thank you.
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