Repairing Aluminum Boats

Aluminum boat keel

Aluminum boats can withstand a lot of abuse without undergoing any serious damage. However, if you happen to spring a leak this could lead to an uncomfortable or even dangerous situation. Repairing aluminum boats is easily done at home as long as the gash or hole is no more than 1-inch in diameter.

Things You'll Need

• Raised supports (optional) Paint or tape for marking 3M 5200 sealant Putty knife

Instructions

1. Pinpoint the exact source of the leak. Place the boat in the water with the interior thoroughly dry. Watch for the place where water is entering the boat. You may need to enlist the help of friends to help you detect the leak.

2. If finding the leak is not possible using the first method place the boat on a trailer, sawhorses or any other raised supports with open area underneath. Fill the boat with water until you can see where the leak is located.

3. Mark the place where the water is entering the boat, both inside and outside with paint or tape. Then, clean the surface of the aluminum thoroughly.

4. Apply 3M 5200 Sealant to the area of the leak. Apply to both the inside and the outside of the aluminum boat to ensure a tight seal. Open the tube of sealant and apply like caulk.

5. Use a putty knife to smooth the sealant over the area of the leak. This will form a durable seal that should last for several years without resistance. Allow the sealant to dry and cure completely before putting the boat into water.

Tips & Warnings

• If the aluminum boat is leaking from under a seat, you can patch it on the outside only or saw a hole in the side of the seat to repair it from the inside. When using the sealant it is important that the aluminum be as clean as possible prior to application.

• If there is a gash or hole in the aluminum boat more than 1-inch in diameter, the boat should be taken to an aluminum welding shop for a sturdy repair. If using the second method for detecting leaks, do not overfill the boat with water. This could cause structural damage. Fill with enough water to cover the bottom and find where water is escaping. Do not buy more sealant than you need to repair the leak. It will cure in about 48 hours even if you have resealed the tube. For a small hole, a 3 ounce tube should be more than enough to do the job.

Resources

• Read this Article in Spanish