First Lost-Foam Casting

[the artfull-codger]

(03-17-2013, 06:46 PM)Sunset Machine Wrote: <chuckle> We're pouring the metal on top of the foam, correct? Burning it out with a smoking fury, from inside of the mud shell? What's the mud do that the sand doesn't?

It's supposed to make a better finish as it's smoother than the sand & also hold it together better [so I've read] never used it myself but I'll try it out,some use ordinary sand,is this true?? perhaps someone more knowlegable will let us know, I've allways used fairly dry moulding sand,the downside is it makes the sand stink.
Graham.