07-26-2011, 02:59 PM
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Another easy way is ti use acrylic paint, (Like Krylon H20 or Krylon Fusion) and spray several light coats on. Let dry and cure (3-5 days). Go into your yard and dig a hole, remove a little soil. Let it get dry and crumbly.
Spray again with the Krylon, this time quite heavy, and while it's drying cover it in the powdered soil for a couple hours.
(Sand would also work, but gravel would be too heavy.)
When it's dry,gently pull it out, and let it dry some more until 'cured', a few days, a week is best.
After this time, you can submerge it in a bucket and swish it around. The dirt will fall off in clumps. I might get around to showing you a cave I made out of styrofoam... No pics at the moment.