I’ve just received a nice new shiny pair of brake and master cylinders from Sue Miller [Girling and a good price as usual].
Is there any sort of sealant or “varnish” that one can coat the cylinders with to stop them gradually discolouring - or is it a question of keeping them polished?
The best method I have found is to strip the cylinders, mask them up, bead blast them gently then spray with conformal coat as used in the electronics industry. Bead blasting provides a very good key and conformal coat gives a well proven enviromental barrier to most things.
I use some stuff I got from Carcoon (the car storage people) It’s a spray can of water dispersal and corrosion protection fluid. I spray it on eveything that’s not painted. You can even spray it on brakes: