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dbr-
That would be the ideal. Out of curiosity what would be your concern about the limits of an exterior varnish on mdf?
For context:
My brick shed is a bit damp due to being single corse, no air brick and next doors garage being above the dmp.
I'm planning out a pegboard on one wall, but the metal ones are incredibly expensive. Unfortunately I haven't seen any MR MDF ones. I don't think the standard hard board ones would last.
I know the ideal thing would be to sort the cause of the damp, but that's quite involved and not a reasonable use of my time against the various other work that needs doing.
hugo7
If you put mdf pegboard in a damp environment, what would you seal it with?
Would waterbased exterior varnish be OK?