I've got a H28.5 and
paint the bottom every spring (like I did today!). I use a moderately priced ablative paint (West Marine CPP Plus, currently offering a $35 rebate)to minimize the need for sanding. I've found that power washing the bottom a day or two before painting it is normally all I need to do. I put on one relatively thin coat with a 1/4 inch roller and change the color each year. That let's me know how much of the new paint has ablated. While blue looks good on most Hunter's, I used red this year and am quite happy with that look. In the end, the color hardly matters once the boat goes back into the water. If you have the typical Foss Foam rudder, and it hasn't delaminated yet (smile), paint that white to reduce the heat build up that eventually does lead to delamination.