Yes , thanks . I do have a gas lens set up on the torch. I am using a Miller syncrowave with settings I got from their on line calculator. I have 1/4" alum. sandwitching the sheet metal to help pull the heat away. I am also leaving a gap inbetween the 2 pcs and using .035 filler rod. It still wants to dimple and being polished its very noticable. Forget about running a bead also, I am stich welding it. Anything Im missing?