I just used a spray can of Halford’s car paint. Grey primer and Vauxhall Brown I think, which was a near match to the wheel hub insert. I don’t suppose it will last for ever but so far it’s OK, after about 5000 miles. Easy enough to give it another coat if needed.
The spokes did take quite a bit of sanding and I applied a clear laquer. A bit fiddly masking the joint between the spokes and the steel rim.
I don’t have the facilities to spray paint epoxy paints and a lot of work for a couple of minutes spraying.
Roger