Craters. Sinkholes. Cavities. Whatever you call them, they form in all kinds of waxes.   Often, just pouring "cloudy" or "slushy" helps minimize them.  Sometimes heating your containers helps.    During a recent test pour of several different vessels of varying sizes and materials, something hit me upside the head like a V8: those big, thick,really warm ceramic vessels always cool perfectly! The tins and smaller vessels left cold developed major cavities even when the wa