A crack filled with anything is always going to look like a crack filled
with... well you know. The best solution would be to reglue and clamp the
Otherwise, if the crack is simply a visual defect get a putty stick at the
local home center that matches the already stained wood. These are like
crayons that easily fill cracks providing they are not much wider than the
Thickness of a fingernail.
As Leon points out, no matter what you do, the crack will be visible.
If you truly want a structural repair, mix up some laminating epoxy with
a slow hardener, then add about 5% denatured alcohol to thin the mixture.
Pour epoxy in crack, allow to set about 1-2 minutes to allow
penetration, then clamp.
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