Looking for some sealant that becomes extremely hard and will be placed under a concrete slab I've cast. To fit the slab, I've wedged a wooden wedge in, as seen in the picture below.

plastic pudding? hmm, is there any hard sealant

A wooden wedge under a concrete slab on a cabinet, used for alignment.
 
  • Wedge under concrete slab and white surface, highlighting a gap filled with wood shim.
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