Guide to bottom paint

Guide to Applying Bottom Paint

Properly applied bottom paint protects your boat against fouling and ensures better performance. Follow this guide to achieve the best result.

Preparation of a boat that has previously been bottom painted

1. Cleaning: Start by thoroughly rinsing the boat's bottom with fresh water to remove dirt, algae and any old, loose paint.

2. Sanding: If the bottom is very dirty or previous paint layers are uneven, a light sanding with sandpaper (80-120 grit) can help adhesion.

Preparation of a boat that has NOT previously been bottom painted

1. Cleaning: Start by thoroughly rinsing the boat's bottom with fresh water to remove dirt and algae

2. Degreasing: Use a suitable degreaser to remove grease, oil and any wax from the mold.

    

3. Sanding and primer: If the bottom is bare gelcoat, sand with sandpaper and apply a suitable primer to ensure the bottom paint adheres properly

Applying Bottom Paint

1. Choose the right bottom paint: Use a bottom paint that suits your boat type (sailboat, motorboat, fresh or salt water). See the chart below for recommended usage.

2. Stirring: Stir the paint thoroughly before you start applying it.

3. Application method:

   • Use a paint roller or a wide brush for even coverage.

   • Start with the edges and work systematically across the bottom.

   • Apply in thin layers to avoid lumps and unevenness.

4. Number of coats:

   • First time: Always apply two coats for maximum protection.

   • Maintenance: Apply one coat per year.

5. Drying time: Follow the manufacturer's recommendations for drying time between coats, typically 4-6 hours depending on temperature and humidity.

Bottom Paint Chart

Finishing

• Remove masking tape immediately after the final coat for clean edges.

• Wait before launching: Most bottom paints require at least 12-24 hours of drying time before the boat can be launched.

• Storage of leftover paint: Seal the bucket tightly and store it in a cool, dry place for later use.

Tips for Better Durability

• Paint the bottom early in the season to ensure full curing.

• Avoid applying the paint in direct sunlight or at very high humidity.

• Check the bottom regularly for damage and repair needs.

With this guide, you can make sure your boat stays protected and performs optimally on the water. See our selection of Bottom paint and accessories at BoatLab.dk.