Originally Posted by Philipm

One person's word for is just as strong or weak as another person's word against... so whether it happened or not is up for discussion.
The EFRA rule in place in 2011 bans what is known as "tyre additivies", however there is no clarification on what a tyre additive actually IS, or how to test for it conclusively rendering the rule useless and ambiguous in it's interpretation. I think this is the weakest area of said rule, even if a driver was recorded during the application process the lack of clarity on what is and what isn't a tyre additive, although this might all be the point..

e.g. Someone walks by a driver's pit area, he's cleaning the lower arms with WD40 and happens to spray a bit on the tyres... is that considered a tyre additive ?

Whilst glueing some people use accelerators to speed up the glue curing process, is that a tyre additive?
In the latter case, the spray is applied evenly to 'a surface' of the tyre, it may not be the contact patch, but sidewalls...

Just like the maximum 25% nitro rule currently in place in Europe, unless there is conclusive method of testing which gives reliable results - not ambiguous readings than you cannot enforce a rule effectively.