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Yup, superglue, although superglue is a registered brand name, the stuff in the bottle is cyanoacrylate. Fills in grain and leaves a hard plastic like finish over the wood but takes quite a few coats...

Epoxy work good, another finish to try is catalyzed varnish. Very durable stuff, I use it on portafilter handles for espresso machines. Takes the 200 degree heat without blistering and the humid...