I confess that I do repair "clinchers" in some cases, and have suffered nothing worse than the use of a little time. I mostly repair tires that have lots of life left, or that are Right for a particular vintage bike.
I use a piece of old (usually sew-up) casing as an inside patch. I sand the surface of the patch-piece and the casing, then use contact cement per instructions, and use a C-clamp to hold them while drying. Being a belt-and-suspenders type, I to dust the area with talc before mounting, to keep the tube from gluing itself to the casing.
I've never had one of these fail, and never been able to feel it while riding. harvey sachs mcLean va.
++++++++++++++++++++++++++++ BOB FREITAS: Your experience points out why not to use them (and certainly not try to fix them) Years ago on a fast downhill turn, a pal of mine proceeded to roll a tire and went straight off the road ,luckily a barbed wire cattle fence kept him from getting really hurt(not kidding) he was covered with cuts and raspberries but we stopped the next farmer and he got a ride back to town. Ever since then I have been very conciencious about tires on my bikes (and cars) I may over do it in stock piling tires but when I find some that are good (and usually not much money) I stock up.
RITA doesnt seem to mind 50 tires hanging in the garage (now if I can only remember what I did with the other 20) ++++++++++++++++++++++++++++++++ JERRY MOOS:
I completely agree. I never try to repair a tire. Toss them and buy new ones. Especially clinchers. If you shop around, you can find really good prices on the excellent Panaracer Paselas, particularly if you use 28 x 700C or wider. In narrower sizes IRC makes some excellent tires at reasonable prices. Both are available in classic colors. About the only tires I might repair would be old setas that punctured before they had much wear. And then I'd send them off to a place that does this professionally. Life is too short indeed.