Thin Film Bottom Paint
Bottom paint (anti-fouling paint) is a paint or coating designed to discourage weeds, barnacles, and other aquatic organisms from attaching themselves to (and in the case of wooden boats, eating) the underwater portion of your boat's hull. Bottom paints have traditionally accomplished this by including a biocide, with copper being the most commonly used in today's formulas. In general, the more copper or other biocide a paint contains, the more effective, and expensive- it is.
Thin Film Bottom Paint is for racing sailboats and powerboats that is formulated to reduce friction and drag. When applied Thin Film Antifouling paints immediately give a hard, super smooth, racing finish that would normally take days of tiresome sanding.