And you must STIR!!!! dont just throw it in and cook for 3 min... you will scortch it and the fumes are toxic.
heat for 1 min then stir, heat for 1 min and stir, repeat... and it will be comes thick and keep repeating the process... after the thick stage it will start to become liquid and ready to go!
*** this is fresh plastisol though.. not if your just reheating old worms