Applying Antifouling to The Hull

MSATT Facilities, Projects and Maintenance

November 11, 2023

Tobago Sailing

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Applying antifouling paint to the hull of a sailing yacht is an important maintenance task to prevent the growth of marine organisms and keep the hull in good condition. Here’s a step-by-step guide along with the materials and tools you’ll need:

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Materials:

1. Antifouling Paint:
Choose a suitable antifouling paint based on your sailing conditions (freshwater or saltwater, warm or cold climate). Different types of antifouling paints are available, including hard, ablative, and hybrid.

2. Protective Gear:
– Disposable coveralls or old clothes
– Gloves
– Safety goggles or glasses

3. Masking Tape and Plastic Sheeting:
To protect areas you don’t want to paint, such as through-hull fittings and the waterline.

4. Sandpaper:
To prepare the hull surface. Use a grit suitable for your paint and to remove any existing antifouling paint.

5. Filler/Primer (if needed):
To fill any dings or imperfections on the hull.

6. Solvent/Thinners/Cleaner:
To clean the hull before applying the paint.

7. Stir Stick or Drill Mixing tool and Mixing Container:
To ensure the paint is thoroughly mixed.

Tools:

1. Paintbrushes/Rollers:
– Use a high-quality brush or roller suitable for the type of antifouling paint you’re using.

2. Sanding Block or Electric Sander:
Makes the sanding process faster and more consistent.

3. Scraper:
To remove any loose or flaking paint.

4. Drop Cloths:
To protect the ground around the boat.

5. Buckets/Containers:
For cleaning and holding tools.

Steps:

1. Prepare the Boat:
– Lift the boat out of the water or use a cradle to access the hull.
– Clean the hull thoroughly using a pressure washer or hose to remove any loose dirt, barnacles, or algae.

2. Remove Old Paint:
– Scrape off any loose or flaking paint using a scraper.
– Sand the entire hull to create a smooth surface for the new paint. Pay extra attention to areas with existing antifouling paint.

3. Repair Damaged Areas:
– Fill any dings or imperfections with a suitable filler.
– Sand the filled areas smooth.

4. Clean the Surface:
– Wipe down the entire hull with a solvent or cleaner to remove any remaining contaminants.

5. Mask Off Areas:
– Use masking tape and plastic sheeting to protect areas you don’t want to paint, such as through-hull fittings and the waterline.

6. Mix the Antifouling Paint:
– Stir the paint thoroughly using a stir stick.

7. Apply the Antifouling Paint:
– Use a high-quality brush or roller to apply the paint evenly.
– Follow the manufacturer’s recommendations regarding the number of coats and drying times.

8. Let it Dry:
– Allow the paint to dry completely between coats.
– Follow the manufacturer’s guidelines for the recommended drying time before launching the boat.

9. Clean Up:
– Dispose of used materials responsibly.
– Clean brushes and rollers according to the paint manufacturer’s instructions.

10. Dispose of Waste Properly:
– Dispose of any paint waste and used materials in accordance with local regulations.

Always follow the specific instructions provided by the manufacturer of the antifouling paint you choose, as different products may have slightly different application processes. Additionally, make sure to check and comply with any local environmental regulations regarding the use and disposal of antifouling paints.