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You can remove dried barnacles from a fiberglass boat using a stainless steel scrubber or a pressure washer for large barnacles.
Fibreglass is best painted with a two part (twin pack) polyurethane paint.
Painting your boat is hard work, so you don't want to have to do it more than you have to because the paint is chipping. If you apply an epoxy barrier coat before applying antifouling paint this will ensure very few chips appear.
Yes, several brands have their own products but they all generally provide a controlled release of antifouling biocide at the paint surface, and will not lose its effectiveness when the boat is hauled out of the water for extended periods of time. So these paints are good for in and out of the water. Yes, boat paint is a special formulation that resists deterioration due to water and saline conditions. Boat paint is extremely expensive to purchase and have applied, and it is extremely toxic.
Ofcourse! Most motor yachts are aluminum construction ,they would not go very far without antifouling coatings . Look for a high quality non copper based coating such as Pettit Ultima ECO. Also available is vivid ,I believe that is Pettit too. Doesn't hurt and you should prep the hull with barrier coat and primers.
Fiberglass is actually very flammable.
I would think a fiberglass boat is better than a wooden boat because a wooden one can rot and would be hevy to move weres the fiberglass boat wont rot and is light so would be easy to move.
A sponge and some fiberglass sealers works the best on a fiberglass boat. There are other fiberglass cleaning material available depending on what your particular need is. For just basic cleaning, I would go with the sponge and fiberglass sealer.
You can clean fecal stains from a fiberglass both by using hot water and dish washing liquid. Let the stained area soak in the soapy water for awhile before wiping it down.
In my experience, it's impossible. The rollers are usually the yellow polyurathane or black rubber type, which cannot tolerate paint thinner or acetone without melting. Since bottom paint is oil based, you have to use those two to remove it. Not to mention the next time you move the boat on the trailer that paint will mark up the rollers again.
A boat floats by keeping water outside, regardless of any material