Painting boats
If you use a better paint that will last longer you will spend more money. The best paint for color retention, gloss retention & abrasion resistance is a linear polyurethane paint such as Awlgrip. Awlgrip can be purchased through West Marine, but normally it is applied professionally. It is very hazardous paint to breathe, so you really need to protect yourself. They offer mixes for spraying or for brushing. After proper preparation (cleaning, sanding & cleaning - very important for a good finish)you must apply a 545 epoxy primer which will seal up porosity in the old gelcoat, put a barrier coat between the Awlgrip and less noble paint as well as improve adhesion. Then you can apply the top coat (2 or 3 thin coats are always better than one thick coat) according to how you wish to apply it. For spray the paint is mixed with Awlcat #2. For brush use Awlcat #3. Read all the product info to understand what you are doing.For nonskid surfaces mix you paint not only with the Awlcat, but also with flattening agent to make it not shiny to reduce the slippery surface when wet - even if a grit is included. Other paints to consider is Interlux or Pettit type companies who offer a do-it yourself polyurethane two part paints formulated for brush applications. Brushing and tipping is recommended. Have friends help. Don't do it on hot sunny days (if outside) and certainly not windy days where bugs and sand will end up in your paint job. Have one person roll on the paint (after proper sanding, cleaning and priming, of course) while another follows with a good brush for urethane paints (same with roller) and tips it off. Again, 3 thin coats is better than 1 thick coat to reduce sagging). Other paints to consider which are good, but not as good (and less expensive than Awlgrip) would be one-part polyurethane paints such as Interlux' Brightside. Other paints like alkyds and other formulations look good, are cheaper and apply nicely, but don't last as long as the urethanes. So you must consider your boat, your budget, how nice you want the finish and how long you want it to last.