The first thing you want to do is check that nothing has broken, spilled, or dried. The emulsion with be thick like glue and blue in color. The remover will be thin and clear like medical alcohol or bleach. Both should have cardboard gasketed lids and foil caps on them. The sensatizer (tiny bottle) should be either dry and at the bottom, or thick and at the bottom. If any of the sensatizer is spilled out of the little bottle (along the threads or down the side) send the kit back for a new one immediately. The product is good if you get it undamaged, but Speedball uses incompetant monkey powered robots made from scrap pulled from the Robot Wars set to package everything so check your stuff.