I poked a hole in a new tube the other day with my sloppy mounting of new tyre and tube. Used one of those green Slime Scab patches. Let dry overnight, but blew it off next day when I pumped up tube for test. I think hole was too big. Although on another tube, I still have one of the Scabs holding over a pin hole. Anyway got some "real" vulcanized rubber patches and repaired the new tube. I have at least one tube with four patches. (Finally found the fine wire sticking thru tyre after 3rd flat). I prefer the vulcanized patches. Apply per directions and clamp in wood vise overnight to dry. For my rides I carry 1 tube to change, taking flat tube home to patch. I only toss tube if leak is a torn seam or at the valve, as shown in pic a few posts back.
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BierHaus Bertolette Road Bike, built 2007
BierHaus SRT Trail Bike, built 2010
Fuji Mt. Pro - 2007