Primo they ain't. They do have penetration though. I ground it down, and fixed four pinholes, and finished with a 80 grit flap disc, looks good. Also, I've been meaning to hype this old can of clear enamel I'm using to coat the patches. The brand name is fixall, and it covers well and dries quick. There is some German spray paint at work which comes with the new machines for touch up which is also awesome. It is Frei Lack. (Translates to free paint - wierd)

Any tips are welcome. I ran the welder on power #2 for these welds. Setting #3 works a bit better for joining two stainless patches, but I'm hesitant to try it on the old steel.

The stainless patches are 18ga but I think the body is 20ga.

The patches are being butted without gaps, that may be part of the issue. I'll try to remember to leave a small gap, about a sixteenth.