I have gotten a few nice molds and a few not so. I read a thread on restoring a Lyman mold. The one thing I have done differently is to cold blue the sprue plate and the outside of the mold itself. My question is if I blue the inside surfaces of the blocks should I do the cavities or not? I know the bluing will not adhere/have a reaction with any residual lead. Should I not worry about it. Or should I just spray them with Kroil and be done with it.