Off the top of my head.
If you are just remelting old plastics:
- Microwave (never to be used for food again)
- Pyrex measuring cup(s)
- Stirring implement, I just use an old butter knife
- Safety equipment (Goggles, Gloves etc.)
- Something to ventilate your work area (hood fan) if it is indoors
- A respirator is a good idea
If you are starting from scratch you also need:
- Plastisol
- Plastisol Dye
- Glitter (made for high temperatures, not craft store stuff)
Check out tackleunderground.com, anything you could want to know can be found in their forums.