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 What to Consider When Painting the Bottom of Your Yacht Alerter l'administrateur Recommander à un ami Lien de l'article 

IF YOU’VE BEEN FOLLOWING THE NEWS LATELY, you may have heard about potential bans on copper bottom paints in various countries and U.S. states. This has led to an influx of new copper-free bottom paints.
Yet many of these paints are coming onto the boating market with new biocides (the active ingredient in antifouling bottom paints) whose long-term effects on the environment are unknown.

TBT is a typical example of a new and more effective bottom paint that can become a marine disaster; it has been implicated in shell malformation in oysters and many other mollusk problems. Even now, six years after TBT was banned worldwide, traces of it can still be found in shellfish and in higher parts of the food chain. With new “super” materials being promoted in copper-free paints, some technical authorities are asking if the marine world is creating another TBT-style disaster.

Few could argue that it doesn’t pay to keep hull bottoms as free of fouling as possible " a layer of slime only one-millimeter thick increases hull friction by up to 75 percent, while barnacles can double fuel usage. Using more fuel means more pollutants are put into the atmosphere. The problem is that many biocides are toxic to sea life.

The trick is to make that toxic area close to the ship’s hull where it matters and ensure that the biocide dissipates after it has left the hull.

There are a number of biocides on the market today. The most common and the ones that occur naturally are copper and zinc. Others have been created specifically to block slime or the onset of fouling and usually are used in concert with copper or zinc. Most of these new products are manmade and there is no record of what happens with them over the longer term.

The method used to disperse the biocide is important Topdon ArtiMini. Older methods, such as incorporating the biocide into the carrier, often result in a relatively short lifespan. To improve efficiency, the paint is sanded several times during the season to expose fresh biocide, but this practice allows biocide residues to sink to the seabed. The latest style of carrier reacts with seawater, as Self Polishing Co-polymer (SPC) paints do; it’s far more efficient and uses far less biocide topdon td300. When the vessel is hauled out, the reaction stops and is not affected by rainwater. SPC paints tend to last longer and give more consistent results than other types of biocide delivery systems.

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