Start of a Dart

Flux core stuff ain't bad. I used if for years before I went mig and never looked back. However if you can solder, or braze, you can wire weld. The biggie is heat and wire feed speed. Too much heat, not enough wire, you pop holes in it. Not enough heat, and too much wire, and you get bird poops.

Doing something like the pan, you want to put tack welds all around about an inch apart to prevent distortion. Let it cool, then put more tack welds an inch apart all around, let cool, and continue until the entire weld looks like 1 continuous seam all around. Then grind it down, tape around it about 1/2 outside the weld on either side, primer it, and seam sealer it. Then pull the tape while the seam sealer is wet.

I recommend scrap metal practice on stuff the same thickness prior to doing the real deal. Welding on something like that spare well you will have to feed a little more wire to weld it than when you practice on a flat table because it's a vertical surface your trying to join together.