Well, I got some QuikSteel (the product that Chris recommended in a much earlier thread), some medium and fine grain sand paper, and some brake cleaner. I am also going to get a turkey baster a little later (to drain some fluid), and try to fix the problem. The mentioned thread is here .

I also got a plastic radiator fix-kit, which appears to have some kind of mesh with a hardening solution. I haven't opened it yet though.

I'm trying to get into the aluminum radiator group-buy, and will let everyone know how it goes. Even if I have to do some persuasion/bribery, I really would like to have an all aluminum radiator instead.