Originally Posted by Papa Tom

I think duct tape is too soft to use as a "tire boot," which is what you are describing. Use either a dollar bill, a piece of a FEDEX/UPS kevlar envelope, etc. to cover the hole in the tire until you can replace it (if necessary). I carry a small strip cut from a bicycle tire sidewall to boot my balloon tires on the rare occasions I need to. You need a sidewall that is thinner than the rest of the tire so it can flex a little, but is still tough enough to keep any grime from pushing through the puncture.