So after reading a few articles (6mm BR and another good one by Ken Howell) I picked up the 650°F Tempilstick. The instructions are to "stroke" the surface and look out for a watery mark. I managed this only a few times. It's tricky too because we all know how quickly the temperature of the case changes in a flame. Howell recommends making a mark on the case, but the Tempilstick crayon is like chalk and won't "write" on the brass. It may crumble and leave a few crumbs on the surface, but the burn immediately and that's useless too. Howell recommends warming the surface a bit before trying to make the mark, but that didn't help either; still couldn't leave a mark on the case. So, whilst everyone seems to recommend the crayons, I'm, wondering if anyone has tips on how to actually make them work for you. Or did I just get a bum old dried out hard Tempilstick? Otherwise is the lacquer a better idea?