ArtMetal

BD
My ceramics experience tells me bone dry is the condition you want a clay body to be in before it is bisque fired..Personal experience if they are not bone dry they crack or can explode. Bad On the other hand as a kid I dug some clay from a creek made it into a spear point stuck it on a stick and heated it in a camp fire.. Got quite hard and didn't crack or explode..I'm inclined to say try the heat gun approach..Steam and hot gases are castings biggest problem area. This investment may be so very porous that the steam and gases escape through it. Bring up to temp slowly. Expect steam and smoke..I think I'd try it. FWIW Brad outside only Test fire some of the material without wax to see what it does.