A room-temperature curable organopolysiloxane composition is provided, which
includes
(A) an organopolysiloxane with the terminals blocked with a hydroxyl group, a hydrolysable
group, or both these types of groups, and (B) an organosilicon compound containing
a hydrolysable group, a partial hydrolysis-condensation product thereof, or a mixture
of the two, and (C) a polysiloxane containing an oxyalkylene group bonded to a
silicon atom via, for example, a CCSi linkage. Application of this
composition to an underwater structure is able to generate an antifouling coating
that is effective in preventing the adhesion and growth of aquatic organisms on
the surface of the underwater structure, and displays superior long term endurance
of this antifouling effect.
