Unfortunately, there are a few instances when you shouldn't use tire sealant: ... Keep it to tires! Sidewall gashes: Slime is designed to only repair punctures in the tread area of the tire. Unfortunately, tire sealants will not repair a slash on your sidewall.

Will fix a flat work on sidewall?

Warning: Fix-a-Flat is not designed to repair completely flat tires. It is also not designed to repair large tears or cracks in sidewall. It should only be used as a temporary solution until the tire can be replaced or a spare tire can be installed.

Does slime ruin your tire?

Will Slime damage my rims? If pre-existing damage is present, we do not recommend using Slime. Do not leave Slime inside your tires for more than 2 years. After that time, we cannot guarantee the integrity of your rims.