I have been using Cop-R-Bote on my catamarans since 1988. Since 1992 on the Crowther D#72 XL2. Cop-R-Bote allows me to achieve a hard mirror finish on the bottom. this is not possible with any other antifouling system. I love the performance advantage I get with Cop-R Bote and I feel good about the environmental benefits achieved by not polluting the waterways with toxic chemicals. Now I am buying Cop-R-Bote for my Corsair trailable trimaran which will be kept mainly on a mooring.