You would have to be real good with a gun to MIG weld THIN aluminum. I would say TIG is the only way to go on thin sheet aluminum. On medium thickness say 14/16 gage its not difficult either way. Thick castings, I have not used a TIG since welding school many many years ago. I am too old to Tig anything that is not on a bench. if you want to TIG the eastwood is not bad, priced alright too. I live real close to the eastwood store in Parma. they are fun to go to and have classes regularly. I have Lincoln or Miller for mig/tig/plasma because years ago those were the only options and my forty year old equipment is still supported for consumables.
Getting it clean is most important. clean it/grind it then clean it out again! you likely should heat it up to get any oil/grease out then clean it with acetone and heat it again -get some heat into it and contaminants out. they will ruin the weld no matter what you use.
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