A thin coating of Sikaflex on the nail ends prevent wearing holes in socks, available only in black or white, if demand grows may be available in coral pink next year.
Isnt this covered in the RYA Yachtmasters first aid section..?
Anti fouling is better than nail varnish if you have to go by dinghy from the hard - easily applied at the same time as doing the boat, just wear open toed sandals. Stops the carbuncles a treat!