Re: Warwick RI area 'bottom paint' reccommendation
Mass Rn, do it yourself and save a ton. First as you said I would powerwash the bottom. Spread a tarp under the bottom of the boat to keep the area clean and safe. Second get Interlux 202 fiberglas solvent wash. This will clean the bottom. Have plenty of clean rags handy and use them generously. Third, put a scuff on the bottom with a 7-800 grade sandpaper, this will allow the bottom paint to adhere better. Use tack rags to absorb the dust, and keep the surface clean. Tape off your water line with a good tape so you get a crisp, clean water line with no paint runs.
Choose your bottom paint , modified epoxy goes on and stays on and does not wear off, but its effectiveness does. Ablative paint goes on and will wear off, like a bar of soap does as water passes over it in the shower. Choose single season or multi season. There are other paints that add slime protection as well. The price goes up as well. If you choose ablative paint, choose a color different from your hull bottom color that way you can see where it wears.
Lastly take your time and prep it right and your boat will come out looking like a million bucs.
Hope this helps,