Re: How to paint 12 foot fiberglass saiboat ??
You first have to answer a couple of questions like:
Is this boat going to sit in the water for extended amounts of time (+2 days or so)
How often do you want to paint?
How important is the finish of the paint?
These types of questions will steer you in the direction for product selection.
Physically you have to clean the bottom of the boat. Once the hull is nice and clean you are going to have to sand the entire hull. You don't have to get all of the old paint off, you will quickly develop a feel for what is good paint and what is bad.
Once everything is clean and sanded, start looking for cracks, scratches, dings, and stuff like that you can fill. Fill every thing you can, and repeat the sanding process.
After everything is filled and sanded, you need to follow the directions for the primer, but most involve wiping down the surface with some chemical to remove every last trace of dirt, sand, dust, wax, and oils.