Have heard the same about the gunk, also heard it can ruin the TPMS as it gets coveered in the gunk. Hoping I won't need it, haven't done in my last 2 cars, but worst case!I heard this one is a good back up
Although i also hear that gunk does not play well with the foam in the tyres
I may get one as a backup tho!
Holts Tyreweld 500ml
Website does say this tho -
- Washes out of tyres easily after use