I repaired mine about 18 months ago using a guide like the one below. Mine was pretty bad, so i sanded it down with wet fine paper, then once it was smooth filled the scratch with Araldite from Halfords then once it dried sanded it back smooth again.
How to repair fork stanchion scratches
Overall it cost me about £20 and i have not had a single issue with oil leaking. The forks have been away for servicing twice once by Mojo and nothing was said about the damage.
Worth a few hours to save an expensive repair.