yep, i was going to suggest foam tires as well.
i'm glad you found a treatment that works and that you are happy with. as for others, i would suggest testing tire changes before altering the track surface permanently.
what would be an interesting twist on your finding would be to only modify the inside track line in portions to give added traction to portions of the track where it's needed most and give a very realistic look. if you have any left over tiles, i would suggest trying that. i'd be very interested to see it in pictures too.
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