Want to protect your boat from algae and shell growth? Then antifouling paint is essential. A properly applied underwater coating keeps the hull clean, extends your boat's lifespan, and improves sailing efficiency. This article explains all the different types of antifouling, their benefits, and the best way to apply it.
What is antifouling paint?
Antifouling is a special underwater paint that prevents organisms like algae, mussels, and barnacles from attaching to the boat. Without this coating, drag increases, resulting in higher fuel consumption and lower speeds. A good antifouling coating prevents your boat from slowing down and becoming more difficult to maneuver.
Types of antifouling paint
There are several types of antifouling , each with specific properties depending on your sailing style, boat type, and mooring location. The three most commonly used types are:
1. Self-polishing antifouling
This paint layer wears off slowly as you sail, continually releasing new active ingredients. Ideal for sailboats or motorboats with medium speeds. The surface remains smooth and prevents the buildup of old layers.
2. Hard antifouling
A hard antifouling coating forms a durable, solid layer that better withstands high speeds and frequent cleaning. Perfect for fast motorboats or boats that frequently run aground. New coats can be applied directly over the old one after light sanding.
3. Biocide-free or environmentally friendly antifouling
This modern version contains no heavy metals or harmful substances. Instead, the coating creates an extremely smooth surface that makes it difficult for fouling to adhere. This is an environmentally conscious choice that is becoming increasingly popular with recreational water sports enthusiasts.
Benefits of antifouling
- Better sailing efficiency: a smooth hull reduces drag and fuel consumption.
- Hull protection: prevents gelcoat damage and corrosion on metal hulls.
- Less maintenance: dirt and algae adhere less quickly.
- Longer lifespan of the boat: the bottom remains in top condition, even when not in use for long periods.
Applying antifouling: step-by-step plan
Applying antifouling is easy to do yourself with the right preparation and materials. Follow these steps for the best results:
- Cleaning the boat: remove old paint residue, dirt and grease with a degreaser or special hull cleaner .
- Inspect old layers: remove loose parts with a paint scraper or sander.
- Sanding and dusting: matt the surface so that the new layer adheres well.
- Apply primer (if necessary): for bare hulls or when switching from a different type of antifouling. View our range of primers .
- Mix the paint well: stir the antifouling thoroughly to ensure an even consistency.
- Application: Use rollers or brushes and apply 1–2 coats in a crosswise pattern.
- Drying and watering: Follow the drying time on the packaging – watering too early will reduce the effect.
Maintenance and replacement
Check your boat's underside annually. A damaged or discolored surface indicates wear and tear. Clean the hull and reapply a new coat if necessary. A completely renewed antifouling coat will ensure your boat continues to perform effortlessly. Regular maintenance and the use of high-quality paint products are essential for long-lasting results.
Frequently asked questions about antifouling
How often should I apply antifouling?
On average, once per sailing season. With intensive use or warm water with heavy fouling, an additional coat may be necessary mid-season.
Can I combine different types of antifouling?
Only if the paint types are compatible. Always consult the product instructions or use a primer as an intermediate coat to prevent adhesion problems.
What is the best antifouling for my boat?
That depends on your sailing area, speed, and boat type. Sailboats often choose self-polishing paint, while fast motorboats perform better with hard antifouling. View all options here .