Agree that it would be good to verify what coating you are dealing with, and ideally use that if you want a total restoration.
But it just seems like overkill to apply a full new resin coat to deal with very superficial/cosmetic scratches that are always going to come back through normal use (expensive, would add a pound or two in weight, multiple sandings, time consuming, and many opportunities to go wrong if you haven’t done this kind of thing before).
If the original coating is epoxy, a new coat will need to be covered with a varnish anyway to get the required UV protection, otherwise it will discolour, crack and flake over time.
Assuming a test patch comes out fine, a clear varnish coat or two done in a day inside the garage would be fast, compatible with whatever coating is on there now, and easily removed if a real repair is needed in the future. But obviously the OP’s call.