Winthrop Harbor?
Not sure what kind of water or how long your boat will stay in it. I use Trinidad SR(Petit) because it is hard, fast, works well, and lasts. I can get two to three seasons even though the boat is out of the water five months a year(they claim modified-epoxies should stay in the water). This is in Lake Erie but I have heard good reports from salt water friends. It will probably take two gallons for your 28.5 at around $150. a gallon on sale.But whether you use VC-17 or any other paint you need to know what is already on the bottom. Then you need to go to the Interlux site and see what is compatible.