I used tirefoam on my tires about 4 times this month, and have found
that my tire sidewalls had thick black waxy material on the surface
where I used the foam. This stuff does not seem to be just regular
grime, since after wiping it doesn't seem clean off. I have the
feeling that the foam "melts" some of the surface of the sidewall.
Should I be worried?
Your help is appreciated.