It's boating season, which means it'll soon be time for the annoying ritual, scraping of the barnacles.They lache on tide and don't let go, barnacles can be a major pain, as they grow they built calcium deposits under a bolts paint.Their interference with smooth fluid flow can decrease fuel effiency up to 40%, a major problem for larger vessels. Currently, whole paint can be dote with poison, usually based on carbon oxide that let it kill the little critters but the poison also escapes into the water and can kill other marine life. Now researchers might have a better option a paint addititive that kills just the barnacles using their own behavior against them. A toxic based on molecule-created bacteria. The researchers developed a method of embedding that toxic into the paint so that it only gets released when the barnacles penetrates the paint. The finding is published in an university thesis. The scientists determined that toxic was low concentrations, and could be effective for years, which could lower the cost of paying the barnacle bill.