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 Steve: Joint compound is a great item. works great for many uses, Roads and attaching castings. It doesn't shrink much but is does shrink some, so make more than one application if you think you may be applying it too thickly. 1/16 to 1/8 is about right in my experience. Added bonus: You can color it with pigment or artist tube colors rather than adding to color later if it suits your purpose. Randy
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