[Entropy11]

If you’re going to go thicker on the patch I’d make sure you get both 18 and 20ga to practice on. This way you’ll be forced to not only dial in your settings, but also your technique for butt welding 2 different thicknesses.

I like making my patches out of the closest material I can find to the original area. If the area your welding is 20ga, by the time you strip it down to bare and have it all dressed up and ready to weld, new 20ga patch material is already (or most likely) going to be thicker anyways. It’s all personal preference though… just throwing some thoughts out there.