Forgot to mention, you may want to check out "finishing your pieces" with a buffing wheel and metal correct pastes. Again, more expenses, but worth just checking out. You want a mirror finish on a pour? Then you'll want to know what paste and wheel and so on. Check into a makers mark. You want to sell your pieces? You'll want to stamp them. There's a certain kind of plastic bead. Soak it in hot water, press your piece into it and stamp. It'll keep from destroying the "face" of the pieces. It's reusable, tho. Lots of in's and outs. Spare time? Watch some videos.