I havenít heard much good about water based bottom paints but in South Florida you do want to use a paint with an anti-slime additive. Interlux Micron 66 would be my choice. It is a multi season paint that can be removed from the water without losing effectiveness.
Not knowing what kind of paint is already on the boat may cause a problem. You might want to consider stripping the old paint back to gel coat. If you do strip the paint, that would be a good time to apply a barrier coat to prevent blisters.
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