How to Fix Pontoon Leak

Owning a pontoon boat is a dream for many water enthusiasts. These versatile vessels offer endless opportunities for relaxation, fishing, and enjoying the open water. However, like any other watercraft, pontoon boats are not immune to wear and tear. One common issue that boat owners may face is a leak in their pontoons. A pontoon leak can be a cause for concern, but fear not!

In this guide, we will explore the causes of pontoon leaks, the potential risks they pose, and most importantly, provide you with practical steps to fix the problem and keep your beloved boat afloat. Whether you’re an experienced boat owner or a newcomer to the world of pontoons, this guide will equip you with the knowledge and skills needed to tackle this challenge head-on. So, let’s dive in and learn how to fix a pontoon leak, ensuring your water adventures remain smooth sailing.

  • Inspect the pontoon for any visible leaks
  • If you see any, use a patch kit to repair them
  • Look for cracks or holes in the seams of the pontoon
  • If you find any, use epoxy or silicone sealant to fill them in
  • Check all the hardware on the pontoon, such as screws and bolts, to make sure they are tight and not causing any leaks
  • Inspect the pontoons themselves for any damage
  • If there are any punctures or cracks, you will need to replace the entire pontoon

Will Flex Seal Work on a Pontoon Boat?

If you’re looking to make some repairs on your pontoon boat, you may be wondering if flex seal will work. Flex seal is a popular product that is often used for sealing cracks and gaps around the home. But can it be used on a pontoon boat?

Here’s what you need to know about using flex seal on a pontoon boat:

1. Flex seal can be used to repair holes or cracks in the hull of your pontoon boat. Simply apply the flex seal to the affected area and allow it to dry. This will create a waterproof barrier that will prevent further damage to your pontoon boat.

2. You can also use flex seal to repair leaks in the seams of your pontoon boat. Simply apply the flex seal around the perimeter of the leaky seam and allow it to dry. This will create a waterproof barrier that will stop water from seeping through the seam.

3. Flex seal can also be used to patch holes in inflatable rafts or tubes that are attached to your pontoon boat. Simply apply the flex seal over the hole and allow it to dry. This will create a patch that will hold air in and prevent further leakage.

4. Finally, flex seal can be used to coat metal surfaces on your pontoon boat (such as rails or ladders) in order to protect them from rusting or corrosion.

How Do You Find a Leak in a Pontoon Boat?

If you are unlucky enough to have a pontoon boat that leaks, there are a few ways that you can go about finding the leak. The first step is to identify where the water is coming in. This can be done by taking the boat out of the water and looking for any areas where water is seeping in.

Once you have found the general area where the leak is occurring, you can start to narrow down the exact location by feeling around for wet spots. Once you have pinpointed the location of the leak, it is time to start trying to patch it up. If the leak is small, you might be able to simply use some sealant or caulk to plug it up.

For larger leaks, however, you will likely need to replace a section of your pontoon boat’s hull. This is not a difficult process, but it does require some basic boatbuilding skills and materials. If you are not confident in your ability to repair your pontoon boat yourself, there are plenty of professional boatbuilders who would be more than happy to help you out.

In most cases, it is actually cheaper and easier to just hire someone else to do the repairs for you. No matter what route you decide to take, fixing a pontoon boat leak is definitely something that can be done!

Can You Use Jb Weld on a Pontoon?

JB Weld is a two-part epoxy that can be used to bond metal, glass, ceramic, wood and plastic. It can be used on a pontoon, but it is not recommended for use in areas where the pontoon will be exposed to water or high humidity. JB Weld should also not be used on areas of the pontoon that will be subject to high temperatures, such as the engine compartment.

How Do You Seal Aluminum Pontoons?

If you have an aluminum pontoon boat, you’ll want to keep it in good condition by sealing the hull. This will protect it from salt water and sun damage. You can use a special paint or epoxy designed for aluminum boats, or you can use a regular sealant like silicone caulk.

Whichever option you choose, be sure to follow the manufacturer’s instructions carefully. Preparing the surface of your pontoon is critical for ensuring that the sealant adheres properly. Start by sanding down the entire hull with fine-grit sandpaper.

Wipe away any dust with a damp cloth, then let the surface dry completely. Once it’s dry, apply a primer specifically designed for aluminum surfaces. This will help the sealant to stick better.

Once the primer is dry, you’re ready to apply the sealant. If you’re using caulk, cut off the tip of the tube at a 45-degree angle and position it against the hull so that there’s a small gap between the edge of the tube and where you want to start caulking. Apply even pressure as you move along, filling in any gaps or cracks as you go.

Make sure not to overfill them – just fill them enough so that they’re sealed shut. If you’re using paint or epoxy, follow the manufacturer’s instructions for application (usually brushing or rolling on).

How to Pressure Test Pontoon for Leaks

If you have a pontoon boat, it’s important to pressure test it for leaks regularly. Here’s how to do it:

1. Fill a bucket with water and place it under the pontoon boat.

2. Use a garden hose to fill the pontoon boat with water until it is completely full. Make sure that the water level is above the highest point on the pontoon boat (this is usually where the drain plug is located).

3. Plug all of the openings on the pontoon boat (such as drains, vents, etc.).

4. Let the pontoon boat sit for at least an hour so that any leaks can develop.

5. Check all around the pontoon boat for any drips or leaks. If you find any, make note of their location so that you can repair them later.


Fixing a pontoon leak requires a systematic approach to identify and repair the source of the problem. By following a few key steps, such as locating the leak, assessing its severity, and selecting the appropriate repair method, one can effectively resolve the issue and restore the functionality and safety of the pontoon. Whether it involves patching a small puncture or replacing a damaged section, addressing leaks promptly is crucial to prevent further damage and ensure the longevity of the pontoon.

Regular inspections, maintenance, and utilizing proper sealants or adhesives can help minimize the risk of future leaks, preserving the enjoyment and reliability of your pontoon for years to come. Remember, patience, attention to detail, and a proactive mindset are essential in successfully fixing a pontoon leak.