Re: Friction-increasing substances
 

<R02> prohibits this type of stuff:

E. Flammable gasses
F. Any devices intended to produce flames or pyrotechnics
G. Materials that off-gas noxious or toxic gasses
H. Materials that produce hazardous inhalable particles
I. Caustic chemicals
J. Hydraulic fluids or hydraulic components

There may be other rules that prohibit more stuff, please read them all and see!