HOW TO REPAIR YOUR INFLATABLE BOAT *This is also the process for adding glue-on accessories.
Recommended solvent: MEK (methyl ethyl ketone). It is often available at paint, hardware or plumbing stores, sold as a cleaner for PVC pipes or lacquer thinner. For non-critical bonds you might substitute acetone.
1. Atmosphere: Glue with humidity less than 70%; and not in direct sunlight; Temp. 64Â° to 77Â°F is best.
2. Preparation: Gather rags, glue brush; solvent; timer with second hand or stop watch; make sure all the old glue is cleaned off; get your patch cut out, position noted and marked. It always leaves a neat tidy finish if you tape off the perimeter of the patch area with masking tape to avoid over glue.
3. Solvent Cleaning (3 times - to prepare the fabric for a chemical bond with the glue)
4. Scrub both sides (boat and patch or accessory) with MEK on a rag to clean surface. Be careful not to wipe the MEK on areas of the boat or patch that will be seen as MEK will make the fabric sticky and shiny. Use masking tape around the perimeter to minimize this. Wait 5 minutes after the first MEK wash.
5. Apply two more solvent wipes with 5 minute waiting time (timed) between them.
Glue Application. For small repairs you can use the small tube of adhesive that comes with each boat. If you need a larger amount of glue, we recommend Clifton Adhesive.
6. Apply a thin glue layer with stiff brush to both sides. Aggressively work it into the fabric with the brush. If it looks too thin, it is probably correct!
7. Wait five minutes (timed). If glue still looks wet, wait longer.
8. Repeat steps 6 & 7 (total of 3 layers with 5 minute open time between)
9. Wait 10 minutes after third layer of glue.
10. Join the surfaces during the next 10 minutes. Start from one edge and slowly lay the patch or accessory down onto the glued area.
Press out all air bubbles and wrinkles from the center to the edges. On deflated boat rub as hard as possible with smooth tool, e.g. the back of a large tablespoon - force air out from between boat and patch. Be careful not to scratch the fabric.
For davits and hard based accessories, deflate boat and press through from other side to make sure of adhesion. Wipe off excess glue with solvent.
If over 10 minutes or if glue has spots of white haze the glue has picked up moisture and you should try to "reactivate" it. With a clean rag wet the glue surface with MEK but do not rub the glue off (one quick swipe). Then assemble immediately. Press hard. For accessory on an inflated boat you can rub it down vigorously with a rag. Make sure there is no MEK on the rag when using it to run down the part or patch.
11. Wait at least 48 hours before use. Chemical bond will continue to strengthen over next 7 days. Don't be tempted to shorten the process.
12. Pressure test if you want to be sure. Blow it up to full pressure. Leave it overnight.
Humidity and Temperature Control.
Relative humidity must be less than 70%, preferably as low as 40%. Temperature 64Â° to 77Â°F. Bond strength drops very rapidly with heat or high humidity. Take your boat indoors. Don't even think about trying to glue on the dock or near the water or in direct sunlight. Professionals use a specially built, climate controlled room, and still don't attempt to work on a rainy day.
Mark out your patch or accessory perimeter where it will be glued on. Then use masking tape to tape off the area to ovoid getting MEK or glue on other parts of your boat during the repair process. This takes a little time but is well worth it in the end as the glue is hard to get off the boat after it dries and looks very messy when it dries and goes brown from the sun.
Apply glue with a paint or glue brush with the bristles cut short (1/2 to 3/4") so they are stiff. It must be natural hair (i.e. OK for lacquer); bound in metal not plastic; preferably with wooden or metal handle. Careful not to get glue on areas of your boat besides the repair area.
Old glue must be completely removed - solvent, sandpaper, scraping, grinding with a Dremel tool. Glue will not stick to old glue. Clean it off thoroughly. Be careful not to burn or melt the fabric if using a Dremel tool. Constant motion with the tool will prevent this problem.
If your boat has ever been protected with ArmorAllÂ® or another silicone or petroleum based product, wipe the repair area well with MEK, follow the gluing instructions closely.
Pinhole size leaks in most PVC boats sometimes may be repaired simply by use of either Seam Seal or Air Seal liquids available at West Marine or on-line. You might be able to avoid a patch on the boat.
To find tiny leaks, take floor boards out, inflate boat hard. Put some liquid detergent in a bucket of water and with rag or big wash brush, scrub it all over boat. Keep watch for elusive, tiny bubbles. When you find the first leak, keep looking. You might as well fix them all at the same time! Remember, the number one cause of slow leaks is a poorly seated valve. Unscrew, clean. Make sure little rubber O-rings are good. They are the cheapest repair possible.
If patching, cut patches 1 to 2 " larger than tear in each direction and round the corners (a quarter makes a good template for the edges). Little one inch circles pasted over a pin hole won't last. Try to get the same fabric used by the manufacturer for your boat. The inside and outside surface may be different. If you can't match color, sometimes a cleverly shaped patch in contrasting color can be made to look like decoration instead of a Band-Aid. e.g. arrow, lightning bolt, even a new D ring if in right spot. Professionals often put one on each side to look like they came with the boat.
Inflate boat to apply accessories. Deflate to patch air leaks, even if very small. Air pressure will bubble the patch before glue sets.
Tip on how to repair small punctures with a syringe.
Sometimes tubes get punctured by a small wire or a noxious weed. In the southwest we have a nasty little thing called a goat head. It will puncture bicycle tires. It is easy to fix these kinds of holes without compromising the resale value of the boat.
Purchase a Syringe that has a #18 needle. (available at veterinarian and feed stores) Place the needle through the puncture hole. Position the boat so that the needle is at the lowest point. Most of the time the boat must be inflated so that the inside of the boat is not glued together, or that the needle punctures the other side of the boat. It is important that the glue be allowed to puddle up around the hole so that air pressure can force the glue out of the hole and help seal it up. It is also important to be able to remove the plunger and leave the needle in place in the boat. In this way the plunger can be filled several times to insure enough glue in the affected area. Use a paper cup to mix a small amount of glue, and then pinch the top of the paper cup to make a spout. The glue can be poured from easily and slowly into the top of the syringe while holding a finger on the needle end. Replace the plunger, and allow air bubbles to rise to the top before placing the syringe and the needle back together. This is a fairly messy operation. Gloves are recommended. Be careful to hold the needle and syringe together as the plunger is operated. It is easy for them to separate and spray glue on the boat. If this happens have a rag to clean it up quickly before it can do any damage. When pulling the needle out twist it so that the needle itself helps drag some glue into the fabric to help seal the hole.
Do Not Smoke! Glues and solvents are flammable. Use in a well ventilated area. Fumes can be overwhelming. A carbon filter respirator is recommended. MEK solvent smells, but is relatively safe. Always wear safety gear as recommended by the manufacturer of glue, solvent, accelerator, etc.
How do I find and repair air leak in an inflatable boat, kayak or raft?
If you are losing air pressure, (aside from pressure loss commonly caused by colder temperatures), check the boat over for air leaks. Air must to escape somewhere for air chamber to become soft. No magic here. The best tool to find air leaks is soap, shampoo or dish detergent mixed with water in a spray bottle. Start by checking the valves first. Spray around the valve on a suspected air chamber. If you see bubbles forming, check your valve fitting and base and be sure the valve insert is screwed on tight and pushpin is in correct position.
To find tiny leaks on a boat surface, fully inflate the boat until it's hard to the touch. Put some liquid detergent in a bucket of water and scrub it all over the boat with rag or big wash brush. Watch for elusive or tiny bubbles. When you find the first leak, keep looking. You might as well fix them all at the same time! Remember, the number one cause of slow leaks is due to poorly fitted valves. Unscrew the valve and clean the area. Make sure the little rubber O-rings are still good. They are the cheapest repair possible.
If you have no luck finding a slow leak with air bubbles, inflate the boat to it's maximum air pressure and try to listen for the leak. If you can narrow the area down, return with a spray bottle to identify the source of the leak.
Divide air chamber surface into imaginary squares, and apply soapy mix to that square and then look against surface to see for bubbles. If no bubbles are appears after 5-10 minutes, then move to another square. Don't forget to apply soapy water all along seams.
Punctures less than 1/8" in size can be repaired simply without a patch. Deflate your boat, then clean and dry the area to be repaired. Apply a small drop of glue to cover the puncture and let dry for 12 hours. If you need to get on the water sooner, let dry for 30 minutes and then inflate the boat, inflating the compartment with the repair only 3/4 full. This repair might not be permanent so add a drop again at a later date to make it permanent.
Your inflatable boat comes with a repair kit as standard equipment. It is recommended to do repairs in dry weather. Humidity will decrease glue bond. Cut a piece of repair material large enough to overlap the damaged area by approximately 1" and round off the edges. Apply glue to the under side of the patch and around the area to be repaired. Too much glue will often interfere with a proper repair. Allow adhesive to become tacky for 5 minutes, and then place patch on the damaged area. Use a weight to apply 3-5 lbs. of pressure for 24 hours. After the patch has dried, apply glue around the edges for a complete seal (dry 6 hours).