I bought this product knowing it would be good for regular punctures, but still took the risk of using it to repair the sidewall of a tractor tire. Mostly dry rot. I took a risk because the lawn I am using this mower on is uneven and not perfectly level. So I risked getting the slime on the sidewall on my turns and climbs. I was lucky because it sealed my sidewall well for the rest of the season. I know this product works on tread holes and is not recommended for sidewall repairs, but it worked for me. Great job slime!