Hammerite will suffice to a point for a road car, but I learnt the hard way that hammerite + spirited road drive / track = hammerite on fire / burnt paint all over the calipers, wheel inners etc...
I've tried loads of different paints on the hubs and all have failed due to heat at some point or other, best I've found up till now for a silver finish is 'VHT' brand high temp aluminium, for black it's BBQ paint

'Foliatec' red caliper paint is a VERY close match to the VW OE painted red finish, touched mine up a few times

Also, if you're due a disc swap I can recommend the Brembo OE equivalent discs with the UV painted finish on the hubs (dark grey metallic finish), seems very durable, looks great and shouldn't need repainting for a good while if at all...