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put an offcut in the dishwasher for a few cycles and see how it fares.
definitely use something more durable than osmo oil to finish though - as @dbr said an oil based paint (or alternatively a 2 part epoxy sealer) and thin the first couple of coats with a suitable solvent so it gets right into the grain and edges.
lmamammal
Plywood chat - went to local timber merchant - asked for hardwood WBP ply for external use - given this stuff - very thin stripy veneer top surface and plenty of filled voids - seems shit - was also warped. Any idea if it actually is wbp ? I’ve started using it for an external storage cupboard top and door - no sure if will hold up now . Some white osmo on the top one btw - to be followed by clear.