Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack,and then Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack,Tack, and in between those tacks make sure you let it COOL. Too much heat will cause you to burn thru as you're going.
Hammer/dolly would be a good idea too, to help out any warpage that WILL happen at some point. Try a faster wire speed than you have been and make sure you use lowest setting on that MIG. Sheet is mucho diferente than plate.
Good luck!
PS: Ebfabman, sweet panels.........
