i know you might have more difficulty finding stuff in your location, but if you want piece of mind, patching a tube is only to get you out of trouble, patches can become unstuck in the worst situations. You are simply increasing your chance for a flat in middle of nowhere.
better put a new tube as soon as you get home and use the patched one as reserve.
the old man is right, an undersized tube inflated to fill a bigger tire will stretch the patches and make the glue detach. not a good place to cut corners.
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