Thanks GiantDefyGuy. I like your answer best. First though, I'm going to give one of my 20" Kevlar-belted tires the pin-test to see if they have any more puncture-resistance? If not. I'll just wear out the Kenda's and then buy some quality tires; that shouldn't take long given that their most-expensive feature is probably their bright yellow sidewall stripes! BTW: The Kendas are less puncture-resistant than the Slime belt, though minimally. I know they make bullet-proof vests. Why can't someone put that fabric in a tire belt? Then you could get flat protection without spending $$$ for fancy-explanation, designer-brand tires?

To those who think I've ruined my tire liner by puncturing it: Do you really think there's any statistical chance some road challenge will match-up with those precise areas on the belts? If so, I've got a bridge in Brooklyn I'd like to sell you...