I use the microwaves to heat my plastic and then use fry daddy to keep the plastic heated while I inject my molds. I also use the mic to remelt the sprue's to cut down on wast. I have also been doing this for about 9 years and using the microwave is the fastest way to heat plastic for use with a fry daddy, presto pot, or the lee pouring pot that I have found so far. Hope this helps.