Abstract
A new coating system using a non-polluting and antifouling type of silicone paint was presented in the previous paper. The reasons why this proposed coating system has an effectiveness for the prevention of bio-foulings on FRP ship hulls are investigated from the viewpoint of the physical properties of the coated film. As a result of investigations which were done both by measuring a contact angle and a sliding angle of a drop of water on the silicone coated film, and by observing the repelling appearance of colored water sprayed on this film, it was found that the existence of a plasticizer, which is contained as an ingredient in the chlorinated rubber paint being used as an undercoat, has a positive effect on the preventing properties of the silicone coated film. And it can be considered that a sliding angle would be a more useful index to an evaluation of the prevention of bio-foulings than a contact angle.
