There are specific things you need to know about when choosing and making use of paints and sealants to your boat. Paints for cosmetic and protective purposes vary significantly in line with the material being treated.

Among the most complex remedies have been devised to counter rusting in steel hulls. In GRP production boats with hulls coated with gelcoat, the only maintenance required outside is occasional polishing above the waterline, and cleaning and anti-fouling below. Anti-foulings are thick paints containing chemicals toxic to marine life resembling weed and barnacles. Some leach away leaving a spongy residue which can simply be sanded off, while other newer types are ablating, which means the motion of the water wears them away leaving contemporary toxins. The toxins are primarily natural copper, mercury or tin compounds. Some nations prohibit the use of sure anti-foulings, particularly in enclosed waters, so it is essential to check your local legislation.

Fibreglass, if it is to be painted, should first be coated with a fibreglass primer. Wood needs to be sanded smooth and either varnished or primed for a colour coating. The place it is enclosed, wood ought to be treated with a preservative to stop rot. For uncovered wood, a varnish containing extremely-violet filters ought to be used. The best opaque paints for marine use, are the two-pack polyurethanes which are more expensive than enamels, but produce a very hard film. Enamels are easier to use, are thinned with mineral turpentine or comparable, and are easier to the touch up. Polyurethanes are thinned with aromatic solvents like xylene and toluen which give off unpleasant fumes, and being -pack, should be blended in quantities which will cover the required space and used within hours.

Aluminium must be washed with dilute phosphoric acid, and then painted with an etch-primer earlier than being painted with a standard chromate metal primer after which ideally a polyurethane type paint. Galvanized steel ought to be degreased, and then handled with dilute hydrochloric acid to etch a key for the chromate metal primer. Underwater areas, either GRP, timber or steel, should first be painted with a coat of epoxy. Within the case of GRP hulls, this reduces the likelihood of osmosis in which molecules of water pass by means of the gelcoat and form bubbles. Metal boats need a high quality sandblast earlier than the anti-corrosive system is applied.

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