Brake reservoir sealant ?

What do you folks use as a sealant on the nylon fitting that goes into the brake reservior.

thanks
Smilin' Jack

Permatex #3 "Aviation Form-a-Gasket". The non-hardening brown goo stuff in the bottle with the brush in the lid.

It's a great general-purpose thread and fitting sealer for just about anything on an airplane that carries gasoline, oil, or hydraulic fluids. Just don;t get any inside the brake line/fitting itself.

I likeTite Seal gasket and joint sealing compound, use it all the time.