non-stainless pot?

[ironpony]

Hi all,
Second post here, I put my last one in the "novice" section without seeing this Q&A one was here until it was too late. But naturally, I now have more questions!

So I'm in the middle of building up a boka, and still lacking a pot. Found an old milk can in the barn that's rusted to hell on the outside, but relatively clean on the inside- that is, it's non-stainless steel, and there's a big spot of rust on the bottom (maybe 2x4"), but clean besides that. If I manage to scrape or grind that off, is it ok? Also, do milk cans conduct heat well enough?

thanks!