jim i use lc hardener. when i first used it i had the globs from not stirring it enough. i add a cap full to 4 oz of plastic. i put the hardener in first then add the plastic. that way you can feel it on the bottom of the cup. scrap it of the bottom with your stirrer till you don`t feel anymore then stir real good. a friend of mine gave me a battery operated mixer. its not real big or powerfull and works great mixing in the hardener. i still put it in first so its on the bottm of the cup and then use the mixer. i found out its better to put it in first then add the plastic. that way you can scrap it off the bottom of the cup and mix it in real good.