organic waterproof finishes...

Hi guys i need something to seal some organic bonded strand board and i would love to seal it with something which can be bled from trees. in particular i am looking for something compatible with a water based screen print ontop of a paper covering with something which can be sprayed to seal the paint/mock grain?

I have been recommended dutch oil or a sap based sealer but i have no idea about this sort of finish as my main experience is with steels/aluminum brazing/coating/finishing.

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