In truth Marcus I already had tins of Silver, Black, and Clear on the shelf. I used to work lots of classic Lotus cars and POR-15 happened to be the best anti-rust paint (for suspension components, brake calipers, hubs, etc) that I'd ever come across.
As I'd had to paint the brake hubs of my previously owned: S3, A2, and 3.2 TT for exactly the same 'rust' reasons I'd already mixed a colour I wanted, adding some of the black to the silver to darken.
Note: the correct mix to colour works brilliantly on all Audi brake calipers; not the powder coated RS calipers of course!
So, having cleaned all of the surface rust off the RS3 brake hubs I applied a light coat of 'mixed' followed with a light coat of Clear, and this is that shown.
However, I painted Vito's hubs last weekend (his being a 2012 car) and all they needed was cleaning off with an abrasive pad followed with a coat of Clear (plus a trip to the pub to allow the hubs to dry before we could refit the wheelsâ¦) to obtain a similar finish.
If your hubs are heavily rusted then check out POR-15 Metal Ready - I have used this on both hubs and suspension parts before painting and it really is first class.
A shame you're not closer Marcusâ¦