Keel Guard Installation: A Step-By-Step Guide For Boats

Keel guards are an effective way to protect your boat from damage caused by concrete ramps, rocky shorelines, and sandy beaches. They are easy to install and can improve your boat's performance. The process involves preparing the surface by removing any dirt, wax, or mould, cleaning the area with alcohol or acetone, applying a coat of primer, and then attaching the keel guard using its adhesive backing. It is important to ensure proper adhesion to create a permanent bond and prevent water damage. Keel guards are available for boats of various materials, including fiberglass and aluminium, and come in different sizes and colours to match your vessel.

Preparing the keel surface

Step 1: Remove any existing coatings

Before applying the keel guard, it is essential to remove any existing coatings or substances on the keel surface that might interfere with the adhesion process. This includes gelcoat, paint, or anti-fouling products. Use a suitable solvent to remove these coatings, ensuring that the surface is completely clean and free of any residue.

Step 2: Etch or scuff the keel surface

To enhance the adhesion of the keel guard, you need to create a rough texture on the keel surface. This can be done by etching or scuffing the surface with a Scotch-Brite pad or sandpaper (grit 180 or finer). Pay particular attention to the area where the guard will be installed, removing any gloss or waxes. This step not only improves the mechanical bond but also helps in removing dirt, mould release agents, and other contaminants.

Step 3: Clean the keel surface

After etching or scuffing, thoroughly clean the keel area with a suitable solvent. Options include alcohol, acetone, toluene, or byline. Wear rubber gloves and refer to the manufacturer's safety guidelines when working with these solvents. Use clean rags or paper towels to wipe down the keel, ensuring no residue is left behind.

Step 4: Prime the keel surface

Apply a thin coat of a suitable primer, such as the 3M #94 keel primer, to the entire area where the keel guard will be attached, especially the edges. The primer interacts with the adhesive, creating a stronger and more durable bond. Allow the primer to dry completely before proceeding to the next step.

Step 5: Prepare the keel guard for installation

Take the keel guard out of its packaging and place it in direct sunlight for a few minutes to make the material more flexible and easier to work with. This step is crucial, especially if you're installing the guard in a cooler environment. Ensure the temperature is above 60 degrees Fahrenheit before proceeding.

By following these steps, you will ensure that the keel surface is properly prepared for the installation of the keel guard. This preparation is key to achieving a strong and long-lasting bond, protecting your boat's keel from scratches, dents, and other types of damage.

Cleaning the keel area

To clean the keel area of your boat, you'll first need to lift the boat out of the water. This is because it's impossible to thoroughly clean the keel while the boat is still in the water.

Once the boat is out of the water, you can start by jet washing the area to remove any slime or antifoul under the waterline. You can then use a biodegradable limescale remover to remove any limescale from the topsides. This will get rid of any chalky white marks, improving the appearance of your boat.

Next, use a polishing machine to compound the hull, similar to T-cutting a car, to bring back the shine. Finish by applying a UV-resistant wax to protect the hull from fading due to UV rays. Remember to use a filterbund during cleaning to ensure that contaminated waste doesn't end up in the river.

If you're cleaning the keel of a wooden boat, use a soft brush instead of a jet washer, as the high-pressure water can damage the wood and caulking.

Applying primer

Before applying any primer, it is essential to prepare the surface of the keel thoroughly. This involves removing any fiberglass mould release agents, dirt, wax, or mould by etching or scuffing the keel's surface. Use a 3M Scotch-Brite pad or a DA sander to etch or scuff the area where the keel guard will be installed. This process helps create a better mechanical bond for the adhesive. Ensure you don't use anything stronger than 180-grit sandpaper to avoid damaging the keel's gel coat.

Once the surface is adequately etched or scuffed, follow up with a thorough cleaning. Use clean rags or paper towels and solvents such as alcohol, acetone, toluene, or byline to wipe down the keel. You can also use recommended products like Acry-Lac cleaner, Liquid Sandpaper, or Interlux 202. It is crucial to avoid using paint thinner or any petroleum-based cleaners as they may leave a film and compromise the bond with the adhesive. Don't forget to wear rubber gloves and follow the manufacturer's safety precautions when working with these solvents.

Now it's time to apply the primer. For this step, you'll need a 3M #94 keel primer. Squeeze the primer liquid onto a sponge applicator and thoroughly cover the entire area where the keel guard will be installed, especially the edges. The primer interacts with the adhesive to create a strong bond, so don't confuse it with a cleaning agent! Ensure the primer is applied thinly and evenly across the surface.

Before installing the keel guard, it is essential to prepare it as well. Unroll the keel guard and place it in direct sunlight for at least 10 minutes to make the material more flexible and easier to work with. Do not install the keel guard if the temperature is below 60 degrees Fahrenheit.

By following these detailed instructions for applying primer, you will create an optimal surface for the keel guard adhesive to bond with, ensuring a long-lasting and secure keel guard installation.

Exposing the adhesive

Before exposing the adhesive, it is essential to prepare the keel surface. Use a Scotch-Brite pad or sandpaper with a grit of 180 or finer to etch or scuff the keel. This process will help remove any dirt, wax, or mould release agents and improve the adhesion of the keel guard. Make sure to wear rubber gloves during this process and follow the manufacturer's safety precautions.

Once the surface is prepared, you can begin exposing the adhesive. Start by pulling back the centre liner or sheath of the keel guard by 2 to 3 feet. This will expose the adhesive tape. Be careful to not touch the adhesive with your fingers or any other contaminants. The adhesive is pressure-sensitive, so it is essential to avoid any contamination that may affect its bonding strength.

After exposing the adhesive, you will need to align the keel guard with the centre of the keel. Use a burnishing tool or press it on by hand to ensure it is centred correctly. Once the adhesive makes contact with the keel surface, it will create a permanent bond.

Work in small sections, pulling back the protective strips one side at a time, and pressing the keel guard into place. Start from the centre and work your way out to ensure no air is trapped between the hull and the adhesive. Continue this process in 3-foot sections until you reach the rear of the keel.

Finally, go over the entire length of the keel guard with the burnishing tool, applying strong force and pressure to ensure a secure bond. This will help create a watertight seal and ensure the keel guard is firmly attached to the keel.

Remember, the adhesive bond is only as good as the surface it is applied to. Take your time during the installation process and follow the instructions carefully to ensure a strong and long-lasting bond for your keel guard.

Applying pressure

Now that the keel guard is in place, it's time to apply pressure to ensure a strong and permanent bond. Using the burnishing tool supplied with your keel guard, firmly press the guard against the keel. Work from the centre outwards, pulling back the protective liner in small sections at a time. This will help prevent air bubbles from forming between the hull and the adhesive.

Start with the centre section, pulling back 2 to 3 feet of the liner and securing the keel guard in place. Then, move towards the rear of the boat in 3-foot sections, working your way outwards. It's important to work in small sections to ensure a proper bond and avoid any air pockets.

Once you've reached the edges of the keel guard, go over the entire length again with the burnishing tool, applying strong force and pressure. This will help activate the adhesive and create a watertight seal. Make sure to pay extra attention to the edges and contours of the hull, ensuring the keel guard is firmly adhered to the surface.

For added security, especially if you're installing the keel guard on an aluminium boat, use a marine-grade sealant along the leading and trailing edges of the keel guard. This will ensure that no water can work its way underneath the adhesive. Allow the sealant to cure for the recommended time, which can vary depending on the product and environmental conditions.

It's important to note that the strength of the adhesive can be affected by temperature and humidity. The ideal application temperature range is between 60°F to 100°F (21°C to 38°C), with relative humidity between 25% to 75%. If possible, bring your boat into a climate-controlled environment to ensure the hull surface is within the acceptable temperature range.

By following these steps and applying the right amount of pressure, you can be confident that your keel guard is securely in place and ready to protect your boat from scratches, dings, and abrasions.

Frequently asked questions