![]() ![]() If you are out on the road, you can find the leak by dipping your tube in a creek or puddle.Leaks that occur at the base of a valve stem or along the seam of the tube are usually impossible to repair. ![]() You can circle the spot or mark it with an X. ![]() A piece of chalk comes in handy for marking the leak’s location.Even when you think you’ve found the leak, be sure to still check the entire tube, as there may be more than one puncture.Inflating it on the rim and in the tire will help seal the rubber cement bond even more thoroughly as it helps press the patch down onto and into the rubber cement to give even more security that it will hold. Inflate the tube: Inflate the tube, place it into its tire and put the tire back on the rim.Take that backing off, and apply the patch directly over the hole, pressing it firmly down to seal it with the rubber cement. Apply the patch: Most of the time, the patches that come in a pre-made kit will have a thin foil backing which you will need to remove to expose the adhesive.You can hasten this step by blowing on the glue. ![]() The rubber cement should go from clear to cloudy as this happens. Allow the rubber cement to dry, a process that should just take a minute. It is not important if you apply rubber cement directly on the hole or not. Again, this should be slightly larger than the patch you will use. Apply rubber cement: Apply a thin layer of rubber cement at the site of the leak over the area you just sanded.This allows the rubber cement to adhere to the tube. Prep the site: Using sandpaper, roughen the area of the tube that is slightly larger than the patch you will use.If you cannot find the leak, you will not be able to repair it. The leak will give itself away by the bubbles it produces when its section of the tube goes underwater.This is an important step. A more reliable way is to fill a sink with a couple of inches of water, and then placing a portion of the inflated tube underneath the water, rotating the tire until you’ve watched the entire tube go through. You can sometimes find the leak by listening for the hissing and following the sound to the hole. Locate the puncture: Inflate the tube so that you can find the source of the leak. ![]()
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