I've been trying to improve the surface finish of my castings done with the Lost Foam method, and have had some sucess with doing a Wax-Dip on the parts...
I've posted the method and pic's on the web at
http://www.theworkshop.ca under the Metal Casting & Machining page Sections 5 & 7 of "Lost Foam Metal Casting"
Frank
http://www.theworkshop.ca
Wax-Dip for Lost Foam Casting
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