I KNOW that I had read somewhere on this fourm that someone had a mold that just was not casting good bullets, no matter what and used Kroil on it to make it work. Well I had that situation with an old Lyman 257042 single cavity mold for .257 FPGC bullets that had been stored in motor oil. I had cleaned it with ether
Then I recalled someone said something about applying a drop of Kroil on the mold, and it started behaving after that had smoked off. Well...what did I have to lose? I put a drop in the cavity of the hot mold, opened and closed it a couple times to spread it around, and put the mold back in the casting sequence with the other molds I was using. With the single cavity, it wasn't costing me much extra time even if the bullets still didn't come out right. So I kept at it, and approx 50 wrinkled casts later, EVERY bullet after that came out perfect!!!!
So I extended my session another hour to get a good number of these made up to play with!