What is a good source to learn the techniques of injecting your own soft plastics? I have not bought anything as of yet but I'm getting close... I guess more so I want to know about the oils, softners, hardners, and the scents. Do you add these to your plastics mix like you do your color? (softner/hardners yes I know you do) I mean the oils and the scents... Is it personal preference? I just want to start this for my own use. just something to do on rainy days... I don't watch much tv...lol.. Thank you all in advance.