Repairing A Robber Boat: A Step-By-Step Guide

Inflatable boats are lightweight, portable, and perfect for fishing, diving, or exploring. However, they are susceptible to wear and tear and may need repairs from time to time. This article will provide a step-by-step guide on how to fix your inflatable boat and ensure it lasts a lifetime. The process involves identifying the fabric of your boat, gathering the right equipment, locating the damage, preparing the surfaces, applying adhesive, and allowing adequate curing time. By following these steps, you can confidently repair your inflatable boat and get back to enjoying your adventures on the water.

Identify the type of fabric your boat is made from

To identify the type of fabric your rubber boat is made from, you will need to determine which of the three main types of materials is used in the manufacture of inflatable boat collars or tubes. These are Polyvinyl Chloride (PVC), Hypalon, and Polyurethane (PU).

The first method to identify your boat fabric is to consult a list of RIB and inflatable boat manufacturers and their respective fabric types. This will give you an idea of the fabric type used by the manufacturer of your boat.

Another way to identify the fabric is to look at the back of the tube fabric, or the inside of the tube, through the inflation valve or a tear in the inflation collar or tube. Hypalon material is typically a dull dark grey or black colour on the back face of the fabric, while PVC and PU will be the same glossy colour on both sides of the fabric.

You can also try abrading or sanding the inflatable boat fabric in an inconspicuous area. If it is Hypalon fabric, it will turn dull and produce a dust or residue. PVC, on the other hand, will scratch but maintain its glossy colour.

Finally, you can apply a small amount of MEK solvent (Methyl Ethyl Ketone or Butanone) to an inconspicuous area of the tube fabric. If the fabric is PVC, it will feel tacky and may leave some colouring on the application cloth. Hypalon will leave an oxidised (dull) appearance and sometimes some colouring on the cloth, but it will not feel tacky. Please note that these solvents are dangerous and should be used with appropriate care in a well-ventilated area with no naked flames.

Prepare the right equipment

Before you start repairing your inflatable boat, it's important to prepare the right equipment. The first step is to identify the fabric of your boat, as this will determine the type of equipment you'll need. Once you know the fabric type, you can gather the necessary tools and materials. Here's a detailed list of what you'll need:

• Suitable 2-pot glue: Look for a glue that is specifically designed for bonding the fabric of your boat. For example, Bostik Unigrip 999HR with Desmodur RFE used at 10% is suitable for boats made from Valmex®, a premium PVC-coated fabric.
• Suitable solvent: The type of solvent you'll need depends on the fabric of your boat. Common solvents include MEK (methyl ethyl ketone) for PVC boats and Hypalon Solvent Cleaner or acetone for Hypalon boats.
• Roller or other tools: You'll need a tool to help work the two surfaces together. A roller is a good option, but you can also use a hard, rounded object like a screwdriver handle or a piece of shaped hardwood.
• Water-soluble pencil: This will be used to trace around the patch and mark the area that needs to be masked off for glue application.
• Masking tape: Accurately mask around the pencil outline to ensure a clean glue application.
• Clean, lint-free cloth: Use this to clean and prime the repair area with the chosen solvent.
• Mixing stick: A lollipop stick or epoxy mix stick can be used to mix the adhesive according to the instructions.
• Short/stiff paint or glue brush: Cut the bristles of the brush to around half their length to make them stiffer. This will help you apply the glue more evenly over the surfaces.
• Removable marker pen or pencil: Use this to mark the location of the tear or hole on the tube.
• Seam roller: This will help you smooth out any air bubbles and ensure good contact between the surfaces.
• Heavy weight: Place a smooth-sided heavy weight on the patch and allow it to cure for 24 hours or more before re-inflating the tubes.

It's important to note that adhesives and solvents produce fumes that can be harmful to your health. Always read the product labels carefully and work in a well-ventilated area.

Find the area that needs repair

Finding the area that needs repair on your rubber boat is the first step to fixing it. This step is crucial but can be challenging as holes can be tiny and hard to spot. Here are some ways to identify the areas that need repair:

Listen for Hissing or Spray with Soapy Water

Inflate your boat in a quiet place and listen for any hissing sounds that could indicate a leak. If you can narrow down the general area, use a spray bottle filled with soapy water to identify the exact source. The soapy water will cause bubbles to form at the leak.

Use a Bowl of Soapy Water

If you cannot identify the general area of the leak, pour some dish soap into a bowl of water and inflate your boat. Then, pour the soapy water all over the boat and press down on it. The escaping air will cause bubbles to form in the area of the leak. Once you find it, mark it with tape or a marker.

Check Valves

If you still cannot find the leak, the problem could be caused by poorly fitted valves. Apply soapy water around the valve and check for bubbles. If the valve is the issue, you may need to remove it, clean the area, and put the valve back in place, tightening it.

Check for Tears and Punctures

Tears and punctures in the boat's fabric can also cause leaks. If you suspect this is the issue, deflate the boat and carefully inspect the fabric for any tears or punctures. Small punctures may be difficult to spot, so using a spray bottle of soapy water or a bowl of soapy water, as described above, can help identify them.

Prepare for Repair

Once you have identified the areas that need repair, it is important to prepare for the next steps. Gather the necessary materials, such as glue, patches, and solvents, and ensure that the environment is suitable for repair. The area should be dry, well-ventilated, and free of open flames. The temperature should be between 18°C and 25°C, and the relative humidity should be less than 60%.

Cut out patches using the same fabric as your boat

Cutting out patches for your rubber boat is a crucial step in the repair process. Here are some detailed instructions to guide you through the process:

Firstly, it is important to identify the fabric of your boat. This is crucial because different boat fabrics require different repair approaches. For instance, if your boat is made of PVC, you will need a different adhesive than if it were made of Hypalon. Knowing your boat fabric will also help you choose the right replacement fabric for your patches.

Once you have identified the fabric, the next step is to cut out the patches. Try to cut them slightly larger than the area that needs repair. A good rule of thumb is to have at least 25mm or 1 inch of patch cover outside the damaged area. Rounding the corners of your patches is also recommended. This helps ensure that the edges don't start to peel off over time.

When cutting the patches, use the same fabric as your boat. This is important because you want the patches to have the same properties as the rest of the boat. Using the same fabric will ensure that the patches blend in seamlessly and have the same durability as the rest of the boat.

After cutting the patches, you will need to prepare the area for repair. Clean the surface with a suitable solvent to remove any dirt or debris. This step is crucial because it will help ensure that the adhesive bonds properly to the surface.

Now, you are ready to start the repair process. Refer to the other sections of this guide for instructions on applying the adhesive, placing the patches, and curing the repair. Remember to follow the specific instructions for your boat fabric and adhesive type.

By following these detailed steps, you can effectively cut out patches using the same fabric as your boat, ensuring a seamless and durable repair.

Clean both surfaces with a solvent

When fixing a rubber boat, it is important to clean both surfaces with a solvent before gluing them together. This process is known as "cold welding" and involves melting the two layers of PVC together. Here are some detailed instructions on how to clean the surfaces effectively:

First, ensure you have the appropriate safety gear. Although not all solvents require it, it is always a good idea to wear proper protection when using any chemical. This includes gloves and eye protection.

Next, choose the right solvent for the job. In this case, you will be working with PVC, so it is recommended to use a dedicated PVC solvent or a mild solution of biodegradable boat soap. Some common solvents that can be used for this purpose include Acetone, MEK (methyl ethyl ketone), mineral spirits, and vinegar. These solvents are effective at cleaning and preparing the surfaces for gluing. However, be cautious when using strong solvents like MEK and Toulene, as they can be too harsh and damage the rubber material.

Now, apply the solvent to a cloth, sponge, or brush, depending on the instructions provided by the manufacturer. Follow the directions carefully, as some solvents may require multiple applications or specific techniques for optimal results. For example, some solvents need to be applied in thin layers several times, with various intervals between applications. Ensure that you clean both surfaces thoroughly and remove any dirt, grease, or residue that may interfere with the gluing process.

After cleaning, it is crucial to allow the surfaces to dry completely before proceeding to the next step. Refer to the solvent's instructions to determine the appropriate drying time. Once the surfaces are dry, you can continue with the gluing process, following the manufacturer's instructions for your specific glue.

Remember to work in a well-ventilated area when using solvents, and always dispose of them properly according to local regulations. By following these instructions, you can effectively clean the surfaces of your rubber boat, ensuring a strong and durable repair.

Frequently asked questions