i'd heard they were fine as long as you tell the tyre place you use it. the place i brought the tyre to after using it basically said 'yeah, fine' when i told them about it.
from the tyre-weld site:
"Thanks to our non-toxic, washable formula, the product can be washed out of the tyre after use, with no lasting damage – a benefit not offered by all tyre puncture repair kits."
from the tyre-weld site:
"Thanks to our non-toxic, washable formula, the product can be washed out of the tyre after use, with no lasting damage – a benefit not offered by all tyre puncture repair kits."