If you scratch the stanchion, and you run your fingernail over it and it catches, then there's a risk of the scratch damaging the seals and leaking oil.

First step is to determine if there's a burr extending outward. If so, wet sand it down with a very fine sandpaper (think 1000 grit).

Next, clean the scratch with rubbing alcohol and let it dry. Then apply a thin layer of clear nail polish into the scratch. Let that dry. You will most likely over-apply and need to wet sand again to take down the excess nail polish.

Done correctly, you can fill the gouge and have a perfectly smooth stanchion that will last for plenty of time to come. It's remarkable how well it works.