There is one other approach available to you. Not cheap, (but not that expensive either) That would be to use truck bed liner instead of paint. It's inherent "rubberiness" composition and texture make it unsurpassed as a non skid coating, while it's thickness and durability make almost wear out proof. It will last for years and years. Simple clean up too.... just hit it with a hose. I used U-Pol Raptor on my boat, (It's like Rhinoliner) and I love it. Soft on the bare feet also. And it comes in many colors and is tintable to whatever color you wish. You can find it on ebay, and depending on how much you use it will take between two to three kits to do your entire deck. This is what my deck looked like after I did it:
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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