How to Use Epoxy Repair Products for Marine Repairs

Whether you’re fixing a gouge in your fibreglass hull or sealing up a cracked paddleboard, marine epoxy is one of the most versatile tools in your repair kit. It’s waterproof, strong, and bonds to a wide range of materials—even in damp conditions.

Here’s how to use epoxy properly on your boat or marine equipment.

What You’ll Need:

• Marine-grade two-part epoxy resin and hardener
• Clean rags and acetone or degreaser
• Sandpaper (80–120 grit)
• Mixing container and stir stick
• Disposable gloves and safety glasses
• Putty knife or plastic spreader
• Fibreglass cloth (if reinforcing a large area)

Step 1:

Prep the Surface

Clean the area thoroughly with acetone or a degreaser to remove oil, salt, or wax. Sand the surface with 80–120 grit paper to give the epoxy a textured surface to bond to.

Use a tack cloth to remove all sanding dust before moving on.

Step 2:

Mix the Epoxy

Follow the instructions on your epoxy packaging—most marine epoxies are a 2:1 ratio of resin to hardener. Use a clean mixing container and stir slowly until the mixture is fully blended and free of streaks.

Be mindful of the epoxy’s pot life (how long the mixture stays usable). Once it starts to thicken, don’t apply it—it won’t bond properly.

Step 3:

Apply the Epoxy

For shallow repairs or surface sealing:

• Use a putty knife or brush to apply the mixed epoxy directly onto the surface.
• Work it into cracks or voids and smooth it out.

For reinforcing with fibreglass:

• Wet out the surface with epoxy.
• Lay the fibreglass cloth over the repair.
• Apply more epoxy on top, saturating the cloth fully.

Step 4:

Let It Cure

Allow the epoxy to cure as directed—usually between 4 and 24 hours depending on temperature and product. Avoid moving or disturbing the area during this time.

Once cured, sand the area smooth and apply a marine topcoat or paint if desired.

Bonus Tips:

• Epoxy cures faster in warm temperatures—store your materials accordingly.
• Use a slow hardener in hot weather to give you more working time.

Autohome Has What You Need

We carry a full range of marine epoxy systems, fillers, cloth, and application tools—plus expert advice on which product is best for your repair. Bring in a photo or describe your project and we’ll help you get it done right the first time.