CASE 9 Antifouling WHY IS IT IMPORTANT TO KEEP THE UNDERWATER AREA OF A HULL FREE FROM MARINE GROWTH? Marine Growth may Damage the Structure A light Surface slime develops on new antifouling in less than one Month If that slime is not removed small areas of weed will also take hold Followed by Barnacles and other small organisms Growth will be more rapid as the antifouling breaks down and allows the organisms to attach themselves strongly to the hull surface What is Antifouling? The traditional Antifouling is a paint designed to protect the underwater surface from marine growth It contains poisons (copper and tin) It is able to be applied by brush, roller, traditional spraying, airless spray Think about the Health and Safety aspects Not all Antifouling works in the same way It can be soft, ablative and self leaching It can be a hard paint surface The purpose or use of the boat dictates which antifouling type is chosen The metal content of the paint may determine the type of antifouling to apply, depending on the substrate surface of the hull (Galvanic corrosion) All boats that are permanently moored should be antifouled Many Trailer boats are also antifouled, would they use the same antifouling? What is the effect on the Boat If the Hull is clean and growth free it is able to perform as intended and take advantage of its own particular design attributes All boats will travel through the water using less effort A yacht will sail faster, a power boat will use considerably less fuel In the case of a power boat the fuel savings could amount to thousands of dollars in one season The effect of underwater growth on the performance of a yacht will give the sailors no pleasure and add hours to sailing passages. Is the underwater hull itself the only problem? What about components such as propeller shaft, rudder, skin fittings, Keel, Bow Thruster’s and Stabilizers? What is the substrate surface that antifouling may be applied to? How often are boats antifouled? And what about water conditions, temperature, fresh or salt water, and a tidal stream. Is Antifouling able to be safely sanded to apply a new coat? Health and Safety In order to improve the sustainability of using a painted antifouling regulations have been imposed on the handling of antifouling from the cleaning of a hull to the application of the paint with strict regulation regarding the manufacture and toxicity of the paint. What do these regulations mean to the Marine Industry? There are brands of antifouling paint which have been developed which are ECO friendly, one example of this is Hydro coat (Petite) which is water based, copper free, and contains a new additive, Econea.