A guy from the Hosta society passed on a good tip to ward off the slugs and snails from your hostas -hair.
Hair has barbs on the strands and the slugs do not like to cross it.
I keep trimming a quarter inch off my fringe and sprinkling it around the plants, and if you know a hairdresser- even better. So far so good, and it is hardly noticeable. Remember to ensure it is quater inch to increase the shaprness of the hair!