Step 6: Final Remarks
Soda cans are not as horrible as most people say. While its true they contain a bit more slag than most other scrap metal, its easily removed, and after being melted down a second time to try to get rid of even more slag, they were reasonably pure. In short, for someone just starting out melting metals, soda cans are great. They're free, melt quickly and easily, and when you end up wasting 30 of them experimenting you don't feel bad about it.
When collecting scrap metal to melt down, be sure that you can actually fit the piece of metal into your crucible, or have a method of breaking it down. A dremel is invaluable in this aspect, with a cutting wheel and about ten minutes, I had a three foot piece of solid aluminum pipe broken down into manageable pieces. The little rubber/plastic caps on pipes melt easily enough, however the screws/rivets need to be cut out of the pipe (again by use of dremel) otherwise it turns into unnecessary slag.