Thanks. Yes, I believe you
Thanks. Yes, I believe you are right about tar/rope repair kits being a better choice in practice; however, it does take some skill and is not for everyone. And yes, I've used those gooey sealants in the past too when I was a poor college student buying $15-20 USED tires---and I'm not talking retreads here. That goo can turn into a bigger problem than the original flat. In an emergency they can still come in handy, but with smart phones today we may be the last generation to ever use products like Fix-a-Flat.