I was gonna leave this one alone, but this is one area where I have a fair degree of first hand knowledge.
First and foremost, Kiwi Grip is the only way to go with the non-skid. This stuff if absolutely fantastic, probably the best, most aggressive non-skid I've come across is 50 years. There's a good reason all the high end race boats are using it - you WILL NOT slip. You damned well don't want to drag your knuckles, knees or elbows over this stuff, but you will never have to worry about slipping, even on a deck soaked with fish slime.
Preparation is very simple. No sanding involved. Just scrub the Hell out of the deck with Comet Cleanser, run thoroughly and allow it to dry for a day. Next day, wipe the deck with denatured alcohol and don't be stingy with it. It will dry almost instantly.
The most difficult part is the masking. This will take teamwork and coordination. After the deck is masked off, the paint is applied by scooping it out with a ladle, then spreading it with a notched trowel with 1/8-inch notches, similar to a trowel that would be used to spread tile cement or grout. Spread the paint evenly, then it gets rolled with a texturized roller, called a Loopy Goopy Roller. One comes with each gallon of paint. This process must be done very quickly as the paint will almost dry while it's being applied. As soon as the texture is applied, someone must immediately remove the masking tape or the edges of the paint will be lifted in the process. DO NOT DELAY!
I used 2-part epoxy paint for all the slick surfaces. I sanded everything with a 160-gritt sand paper, then vacuumed all surfaces, wiped them with a tack rag, then wiped them again with denatured alcohol. This is very important. The paint was applied with a slick roller and tipped with a boar's hair brush. (Figure on that expensive brush as a throwaway.) I allowed the first coat to dry one day, then want back, sanded the finish lightly with 400-grit, repeated the cleaning process, then repeated the painting process. It worked out fine, other than a couple runs that I managed to miss. I used Pettit Snow White and white non-skid. Everyone thinks the boat looks brand new now.
The only folks that I know that have had problems with the Kiwi Grip were those that did not follow the instructions, especially drying everything out with denatured alcohol. That is a very important step.