OK, aftger watching that video, here are a few more hints;
Use a NEW soldering iron, and REMOVE the tip! (The tiphas been pre-tinned, with solder, which does contain lead.)
Use a can with a welded seam. A few cans are still soldered. (Canned milk products.)
Run your chosen can through a burn, to remove all volatile heavy metals. (Put a few lit chunks or briquettes in it, and let them burn out. Do NOT use a can that has had pineapple in it. If you look, it's zinc plated. {Galvanized.})
steve