I bought myself a decent mig similar to yours a few years back and I've had great results with the rust work on my LH. Once you've dialed in the right settings its pretty easy. Only trouble I ran into initially with the sheet metal was it heats up very quickly, however I've since learned to slow down and take my time.
Enjoy
Keeping a damp cloth with you is great to stop the heat building up.
I dont always do it myself, but the best advice I have seen is that if you cant keep your hand on the panel, then it is too hot to keep welding.
So the idea is to weld a little bit. Use the rag to cool the area. Move to another spot well away from where you were, repeat the process.
Having an airblower handy also works well.
Cheers
Rob
