Welcome aboard AC.
Just like Lamar offered up, I take the really heavily scented baits out of the pile as sometimes that scenting smells foul while the plastics remelt. Softener or hardener should not be needed but a few drops of stabilizer won't hurt since it helps protect the lighter color plastic. Once the plastic is melted you can add glitter and/or hi lite to it to get some nice visual effects and most any color except the fluorescent colors can be added to the hot plastic. The fluorescent colors need to go, or should go, into cold raw plastic.