Earlier this year I had my rear brake discs replaced and the part that makes contact with the wheel is painted silver.
Like this...

Just had my front ones done last week and they are bare metal and have already started to get rusty orange marks on them where water has come into contact.


Any ideas what I should do?
In a few months they will look awful through the spokes of the alloys.
I'm thinking I should paint them (=ball ache) but if I do could anyone suggest what primer and paints I should use?
Argh!
UF