Hempel’s Underwater Primer – Grey (750 ml) Marine Primer Paint

Hempel’s Underwater Primer – Grey (750 ml) Marine Primer Paint

Prepare your boat’s underwater hull with a professional-grade foundation using Hempel’s Underwater Primer in grey (750 ml). Perfect for fibreglass, wood or steel hulls, this specialised primer enhances adhesion and helps antifouling systems bond securely — giving you better protection and longer-lasting antifouling performance.

Ideal for boats, yachts, workboats and leisure craft, this marine primer is a must-have first step for any underwater coating job.

🛥 Product Overview

Hempel’s Underwater Primer is a soluble matrix compatible primer designed specifically for use below the waterline. It promotes robust adhesion between the hull substrate and antifouling paints, helping prevent peeling, blistering and premature coating failure.

With this primer, you’ll achieve a more durable antifoul topcoat and better overall hull protection season after season.

⭐ Key Benefits

• 🪶 Improved adhesion: Helps antifouling paint stick to the hull surface

• 🌊 Underwater application: Designed for below-waterline use

• ⚓ Compatible with antifouling systems: Works well with most marine antifoul paints

• 🛠 Enhanced coating performance: Reduces risk of lifting and early failure

• 🎨 Neutral grey finish: Provides a consistent base for topcoats

🧰 Product Features

• Brand: Hempel’s

• Product: Underwater Primer – Grey

• Volume: 750 ml

• Use: Primer below the waterline for antifouling systems

• Suitable For: GRP (fibreglass), wood, steel hulls (follow primer and antifoul manufacturer instructions)

• Application: Brush, roller, or pad application

🛠 Recommended Use

Hempel’s Underwater Primer is ideal when:
✔ Preparing bare surfaces for antifouling
✔ Recoating over sanded/conditioned old antifouling
✔ You need better adhesion in saltwater conditions
✔ You want to extend the life & performance of your antifouling

Proper priming helps your antifoul coating perform at its best — resisting marine growth and prolonged exposure to water.

📏 How to Apply

1. Surface Preparation: Remove dirt, grease, loose paint and contaminants.

2. Key or Sand: Key old antifouling to improve mechanical tooth.

3. Mix Primer: Stir thoroughly before application.

4. Apply Evenly: Brush, roller or pad as recommended.

5. Topcoat: Apply antifouling paint once primer is dry.

Always follow manufacturer application instructions and safety guidelines for best results.

🛟 Perfect For

• Leisure craft and powerboats

• Sailboats, yachts and tenders

• Small workboats & commercial launches

• DIY hull maintenance projects