I do what the others have recommended with regard to sanding, application of glue, and ample drying time. In the past, I've had a few develop a very slow leak, especially if the patch covers a part of the seam, which it usually does. I repair mine at home. I apply glue to an area a little larger than the patch. After I apply the patch, I press it down and roll over it very firmly with something with a hard surface and a smooth round edge. When I started using this method, the occasional slow leaks were no more. I let the repair job stand for maybe 15 minutes or so, then I inflate the tube to approximately 1.5 to 2 inches in diameter, and check it in some water. So far, so good.