When you nuke your plastic be sure you start by sneaking up on your temp. 1/2 a cup 1 minute add a few seconds at a time until you get 350 or so degrees . anything over 370 is heading into danger zone. Glass candy thermometer helps for beginners. most use infrared point and shoot thermometers. NEVER EVER take your eyes of the stuff. Use all the plastic you heat up at once saves the possibility of burning on reheat. If you ever burn it you won't forget that smell soon. Heck your dog won't even come to you.