i have used some very similar substances
KHAN! ( avatar of the previous poster)
all jokes aside, I just got done reviewing you work pictures,,,,
first,,,, when welding, use your left hand as a rest point,,,,place it on the work piece,,,, notes follow ( I am assuming your right handed)
second, Clean the work area..(prep)....You need to remove more paint and primer away from the work area, they create fumes that interfer with the weld process...get the paint at least 1 inch away from weld area (ie grind- sand)
third, when welding, if possible, lay right wrist over left wrist,, ( this gives you finner control of the weld puddle)
fouth, read a book on basic welding......making figure 8`s, fishscales, mig, tig, smaw,gmaw, spot , etc
I have friends that can weld beer cans,, ( about the hardest thing to do-thin aluminum),,,, your not too far off, just need some practice , and input from an instructor etc..