I like Super Ship Bottom Ablative bottom paint. It will stick to bare Fiberglass and any bottom paint, it has a higher copper content, it doesn't need primer, and you only need to apply one coat. It's cheaper than most premium bottom paints. Call first because they only make one color at a time. Use your credit card and have it shipped UPS and it will arrive faster than mine did. UPS charges an extra $20 for the hazardous waste charge, but you'll get it quicker than regular postal service. I just received my paint today. I ordered it back in Feb 25 and I paid by personal check and was going to have it shipped snail mail post office. I told them last week to ship it UPS and they did. I painted my keel, centerboard, and my rudder this afternoon. The hull is next to be painted and I can load her back on my trailer. Good Luck!
Joe
http://www.supershipbottom.com/