you can get the colorants at a few places like lurecraft, bearsbaits, m-f plastics and a few others. You can get your plastic there to as well as scent. The plastic cools down really fast once you inject them. You can open the mold in less than a minute. Until you get the feel for it though, be safe and wait atleast a minute or two. I would not want you getting burnt. It is a nasty burn when you get one. Injectors come in different sizes so it is hard to say how many you can inject at one time