SO GOOD
Probably the best-known sealant, Stan’s is popular for a reason – it works. The hole left by our biggest screwdriver was sealed within just one or two revolutions of the wheel.
To make things harder, we stuck the tool in again and wiggled it around from side to side. The tyre sealed up eventually and we were able to reinflate it to 36psi before the seal broke once again.
NO GOOD
Sidewall punctures are dealt with OK, but performance isn’t quite as impressive as with the two highest-scoring options here, because the Stan’s sealant doesn’t cling to the tyre casing quite as well.
Price 22$ for 568ml (=39$ for 1l)