Sand with little blocks of wood wrapped in stick it paper,  a paint stir stick wrapped in paper works nice too, just wrap the bottom few inches, a dremel for any thickened epoxy white globs, use the smallest foam brush, it fits nicely in the spaces.  Run a drip strip of tape under the inwale.  I use rapid clear from Epifanes for the first 3-4 coats, you don't have to sand between coats, then finish with gloss one or two coats.  Then do it all again as needed after a few months in the sun and salt!