I think that the non-slip surface on an Amel comes from the difference in surface height between the faux teak boards and the faux caulk. 

Those faux teak boards are gelcoat that was applied "too thick" to achieve the look and function. The difference in height is probably 1mm.

I believe that if you took the faux teak boards down 0.5mm, you would lose most of the cracking, then Option 3:

That great performance absolutely does not come from the height difference between the faux boards and faux caulk.  It comes from the fine texture molded into the faux boards simulating real teak lumber. If you sand that texture off, and paint it smooth--you WILL end up with an ice skating rink for a deck.  If shallow 1/4 inch grooves were all it took to make a good non-skid deck there would not be so many dangerously slippery decks on boats out there.

If there is deck damage that can not be locally patched, and sanding and painting the whole deck is where you have to go, you will need to do something other than just apply smooth paint if you do not want to slide around on your deck.

Bill Kinney

SM160 Harmonie