Interlux Ultra-Kote Hard Antifouling High Copper Bottom Paint The Interlux Ultra-Kote is a high performance antifouling paint that is perfect for areas that experience moderate to severe fouling. Designed to provide maximum performance, the high copper hard coating provides excellent long term protection from shell fouling, such as barnacles. Thanks to the fast drying formula Ultra-Koat allows you to paint and launch in the same day. Can be used on Fiberglass, wood, or properly primed still with