Underwater Antifouling Paint Application

1. Why Is Underwater Paint Critical?

The underwater section of your vessel is under constant biological attack. Marine organisms — mussels, algae, barnacles — attach to the hull in a process called biofouling. Biofouling increases fuel consumption by 20–40%, raises drag resistance and increases corrosion risk on steel and aluminium hulls. Antifouling paint creates a biocide barrier that prevents these organisms from attaching.

2. Antifouling Types

Hard antifouling: tough surface layer, biocide released over time — 1–2 years, ideal for fast boats. Self-polishing (SPC): dissolves slowly in water, always fresh active surface — 12–24 months, most common. Hybrid/Dual: combines hard and SPC advantages — 18–36 months. Silicone-based: no biocides, slippery surface — 2–3 years, eco-sensitive zones.

3. Application

Haul out and dry 48–72 hours. Clean with 150-bar pressure wash. Solvent degrease. Sand 80–120 grit. Apply 2–3 coats by roller or spray; measure DFT after each coat. Launch within 72 hours of final coat — active biocide evaporates if left longer.

4. Conclusion

Underwater antifouling is a critical investment directly affecting your vessel's underwater performance and fuel efficiency. DR.YACHT manages the entire process from system selection to application, with DFT reporting and manufacturer warranty.