[SEL] Help with Casting Materials

[Judge Tommy Turner]

I need to send some original parts off to have new castings made.  
However, I need to cover some machined surfaces, plug some holes, etc 
before I do.  I know there is a type of wax that is used by foundry men 
to do this.  I think it comes in sheets, sticks, etc.  Can someone tell 
me the name, type and a supplier of this type material?  Thanks.

Tommy Turner
Magnolia,  KY