I bought a good 4 lbs of all different color PC a year ago and it seems to have lost its magic. I tried two different colors today and they were not going to stick to save its life. When I first bought it the stuff coated beautiful. I even have the ac on in the house today and the fan going. I did a couple of test boolits and it looks like they have the chicken pox. I would guess it's time for new powder and to toss the old? I even kept it double bagged like when I bought it last year.