Prickett ... If I reuse my containers too many times I do get chunks of previously hardened KK. I'm using plain paper cups so its not a big deal to toss them after 2 or 3 uses. I use 2 cups and dump the bullets and KK back and forth till evenly coated then dump them out onto 1/4 inch hardware cloth. Works well for me and can do a lot of bullets pretty quick as I measure the KK and catalyst into 3 or 4 cups at a time then do the bullets. I am going to try to find larger cups at the dollar store. These are just plain paper cups with no coating. Plastic might work as well as the paper.
Nighthunter