Look for a leak in an inflatable kayak using the same technique you’d use to find a leak in a bicycle tire. Prepare a mixture of water and dish soap in a spray bottle. Inflate the kayak fully. Then spray the soapy liquid over the kayak, starting with the areas where you suspect the leak. If you see bubbles forming through the soapy material, you have a leak. You can use patches or glue to fix leaks in inflatable kayaks.