How to Repair a Cracked Transom

Removing your boat from the water makes repairing the transom much easier.

The transom is the flat end or stern of a boat. In many cases, it is made of wood or another similarly hard but lightweight substance, such as fiberglass. Despite being hard-wearing, time and accidents can damage the transom on even the most carefully used boat.

Things You'll Need

• Epoxy resin
• Sandpaper
• Chalk
• Hacksaw
• Marine-grade wood preserve
• Wood glue

Instructions

1. Inspect the crack on the transom to determine the extent of the damage. In most cases, a crack in the transom will be small enough to repair without having to remove or replace large portions of it. Where the damage is more than a thin crack, the damaged portion of the transom will need to be cut away and replaced.

2. Clean the transom thoroughly with water to remove build-up of dirt and debris. This is essential to ensuring repairs take hold firmly and do not simply mask problems that become worse later. Sand down the area around the crack for a surface that the epoxy resin can bond with more easily.

3. Mix a batch of epoxy resin and fill in any small cracks and other gouges in the transom. Allow time for the resin to harden. Sand down the resin so it is smooth with the rest of the surface. Repaint the transom to mask the repair and give a smooth finish.

4. Mark the extent of any larger crack in your transom with chalk. Remove the outer panel on the transom to allow access to the core. Cut away the cracked portion of the transom with a hacksaw. Measure the size of the hole you cut and cut a replacement piece of wood to the same dimensions.

5. Treat the wood with preservative. Glue the replacement panel into place. Allow the glue to dry. Sand down the surface of the old and new transom panels. Fill in the gaps between the old and new transom with another batch of epoxy resin. Allow time for the resin to harden. Sand it down to a smooth surface. Replace the outer panel of the transom.

Tips & Warnings

• Epoxy resin requires the use of a catalyst in order to harden properly. Follow the instructions for your brand of resin; using too much catalyst causes the resin to harden too quickly for you to complete the job, while using too little prevents the resin from setting correctly. It is important that the resin sets fully in order to ensure it provides a watertight barrier.

References

• "Fiberglass Boat Repairs Illustrated"; Roger Marshall; 2010
• Rot Doctor: Wood Preservation, Rot Repair and Restoration Using Epoxy Resin

Resources

• Read this Article in Spanish