I don't use hardener or softener I just get both kinds of plastic from the manufacture but I always use stabilizer. I just add it by the gallon to my bulk plastic but I find the key to having really nice colors is minimize the reheats. You can do this several ways. You can make it up one cup at a time and shoot it till it's done or what I do is my main colors that I use a lot I will heat up 6 cup per color and let it harden then store it in a zip lock and I will tear off just the amount I need to shoot and when I get low in the measuring cup I'll tear more off and keep heating that way I always have fresh plastic in my cup
In our government-controlled schools we are taught that Lincoln was our greatest president because his war ended slavery and saved the Union. As usual, the other side of the story – the side that reflects poorly on the government – somehow gets lost. – Richard J. Maybury, The Abe Lincoln Hoax