Wiktionary
antifouling
a. That prevents or counteracts the buildup of barnacles and other deposits on undersea surfaces such as those of boats. n. Any substance that prevents or counteracts the buildup of barnacles and other deposits on undersea surfaces such as those of boats.
WordNet
antifouling
adj. used of e.g. coatings to protect against accumulation of barnacles etc on underwater surfaces; "antifouling paint"; "antifouling chemicals"
Usage examples of "antifouling".
Sandpaper, calking material and calking compound, antifouling marine hull paint, deck paint and varnish.