Depending on your funds there are a number of things you can do, discussed in either this thread I think?
We haven't tried it yet but looking into edging the boards with something waterproof might massively extend the life of OSB as this is where water gets into where paint hasn't and also sits in the wood (which especially isn't great in winter with frost).
It was just cuprinol fence paint IIRC.
Depending on your funds there are a number of things you can do, discussed in either this thread I think?
We haven't tried it yet but looking into edging the boards with something waterproof might massively extend the life of OSB as this is where water gets into where paint hasn't and also sits in the wood (which especially isn't great in winter with frost).