Two component paint is usually stronger, but also much more difficult to apply.
I can endorse either one or two part Petit paints for doing the whole topside area. While one part (EZPoxy) is maybe 40% cheaper, I can't really say that the two part (EZPoxy2) is really any harder to work with and is considerably more impact and abrasion resistant.
While sanding before the first coat and between coats 2 or even 3 is very important, it is critical that, before you do any sanding, you thoroughly wipe down the entire area with a prep coat which will remove any and all traces of grease and (most importantly) residual wax and polish. If you don't do this, there will be adhesion problems.
Modern epoxy paints are very easy to work with and give great coverage and gloss. If you are going to use a different color or additive grit for the non-skid areas, do the gloss areas first (2 or 3 coats) and then tape off on the cured gloss area to do the non-skid.
If you are using the same color and not using a grit, you will only need to tape anything that can easily be removed. This gives you an easy justification for rebedding all of your deck hardware that is removed for painting easy with butyl tape.
1965 Cal 30
Doing the Loop in 2015