Mask off and brush a thin coat of gelcoat then sprinkle crushed glass non-slip and dust off. It's cheap, provides great traction and lasts. Do not use on areas you will be sitting on (or if you intend to sail barefoot) as it will eat your gear. If you want to 'tone down' the abrasive element overcoat again with gelcoat. Remember almost everything in sailing is a compromise.
Cheshirecatman
That's way overkill on a Hobie 18. Either neoprene or HydroTurf.
Hobie sells a die-cut neoprene kit for the 18 (part #16708)
HydroTurf you can get through this site or direct from the mfg:
HydroTurf 
