The use of copper in antifouling paint, the special coating used to prevent corrosion on metal hulls and propellers, is considered toxic for marine living organisms. The use of traditional antifouling paint can be polluting.
Cysbio’s innovative fermentation technology allows the company to genetically engineer a chosen microbe and use the liquid that is created as a result of the process in the paint coating products that it produces. While the product works as a repellent, it is also non-toxic.
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https://www.ship-technology.com/features/rethinking-the-makeup-of-antifouling-paint/