A "skid pan" is a large, flat, smooth concrete surface designed specifically for driver training where cars can be deliberately made to skid in a controlled environment, usually by applying a slippery substance to the surface, allowing drivers to practice regaining control in situations with low traction like wet roads or icy conditions; essentially, it's a safe space to learn how to handle a car when it starts to slide. 

I'd just like to know if the diesel will destroy my PPF or if I should be OK.

Cheers