Joe, generally when i get time to cast, i try and get as much done as i can, so i coat/cook one batch while still casting a different one. Say i have 125con done, i know how many i have done, but i have the machine running say 125rn and i don't know exactly how many i'll get done that day. I know i could math it all out so i mix only enough for that day, but i know i'm going to use more in the following few days or weeks. With the covid thingie, i have had spare time, i have cast enough in the last few months to use up a little under a kilo of K15, the coating i have mixed up hasn't had enough time to sit and go off for them
I can tell you, my poor casting machine and sizer had sure has had a work out.