At the worlds teams are going to great lengths to bring in tyres in sealed bags, pre dried and I agree, at that stage its very hard to detect. But it has to be applied every run and we are all pitting in a close environment. I think it would be easy because left to dry it would take hours, so you'll see people applying, having wet tyres sat and then drying. Thats how they sorted at the worlds, made everyone do all tyre prep in one room together. It became self policing.
Tyre dust, yes they do produce tyre dust like every tyre we use, rubber or foam. Have a look inside a touring car bodyshell after a run and you'll see masses of the stuff off rubber tyres. Its the same for buggys, it just doesn't have anywhere to settle.
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