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To vary the thickness (of the main stone or the base or other sections) glue pieces together using
a construction adhesive (like Liquid Nails). Gluing various thicknesses together can give you almost
any dimension you may want. I like to fill the seams with Elmer's Wood Putty... it's a durable filler,
it's easy to apply, you can sand and paint it, and it's not that expensive. What I like most about it
is, after applying one layer the seam disappears. The glued section now appears to be from one large
piece.
To assist in holding pieces where you want them while gluing, use clamps, belts, tape,
nails, pins, string... whatever. Clamps are the easiest to use, but be careful you don't compress the
foam while clamping. Items like belts, strings, tape or even something like a bungee cord, can be wrapped
around curved segments needing gluing. Use whatever works to hold the pieces together... things like
straight pins or nails can hold can small pieces quite well together... long enough for the adhesive
to set. One caution however, use tape sparingly and in places where it won't really show. A layer of
foam is "lifted" when the tape is removed, causing the problem of paint not adhering evenly on the undisturbed
foam surface, versus the spots where tape was applied.
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