That is a bit of useful information re: the art of lost foam casting at home. The only thing that I can add as far as a recommendation is to NOT wear tennis shoes and Burmuda shorts while working with molten metal. If the sand had any water content or an air bubble decided to 'pop', I don't think that pile of castings would seem so cool. Leather gloves, apron, face shield along with long trousers and leather footwear are the order of the day.