painting inside of rear brake pistons?

[goggles]

Rear brake sticking on my 1980 gs550L.

Took them apart. Noticed rusting inside the "cup" side of the piston. Wondered if I could clean and then paint that side to prevent or slow down rusting in the future.
(I know you cannot paint the side that slides into the caliper)

[Steve]

To prevent rust, change your brake fluid every couple of years.

The only moisture possible in there is in the brake fluid, which needs to be changed every so often.

.

[SVSooke]

I think the OP is asking about the side of the piston the pad sits on Steve.If you want to paint them go ahead but use a high heat paint.

[Agemax]

cant do any harm at all, but as said, use high temp paint as a precaution.

[gsrick]

A little bird mentioned to me about using caliper paint. It's already designed to withstand the fluid and heat.

[Steve]

A little bird mentioned to me about using caliper paint. It's already designed to withstand the fluid and heat.

I actually use caliper paint to paint the engine and the carbs on my bikes.

.

[goggles]

Thanks for the replies. I think it is a good idea to use high temperature paint!