Hello Alan.
I use the Hycote range of paints they are all Acrylic and the primers are excellent.
The red oxide is a good match IMHO, they also do a primer filler, a sort of yellow colour, this stuff is brill at covering anthing that has minor blemishes in the surface just let it dry between coats and sand off. ( Just wear a mask with this one though ) as always.
All made for the motor trade and available in spray cans of different sizes etc.
As Mankster says Halfords are good too.
Sub