Interlux does make a grit to mix with the paint to create a non-skid surface,
I used Kiwigrip on one Hobie and it worked out very well, I used masking tape to create outlines similar to the original Hobie layout.
The kiwigrip is gentle on your butt & knees too. some tapes are like coarse sandpaper.
84 H16SE (sail #83460 Nationals yellow)
85 H18SE (sail #12610 Prism) *SOLD*
90 H18SX (sail #668 blue/pink)
92 H18MG (sail #14967 Generator/#17022 Baja Blues)
81 H18SE (sail #4908 White/#15483 Breezer)
(a boat or 2 for sale soon...)