How can I protect a painted wooden plant shelf from water?
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You can still coat it with polyurethane for extra protection.
Apply a single, thin coat of either Danish oil or oil-based urethane wood stain, all of which waterproof hardwood while also defending wood from the damage created by the sun's ultraviolet rays.
Try covering top with sheet of lexon plastic
I have narrow clear trays on mine. If you want a sealer, use a waterproof one.