The difficulty is getting the paint to stick what with them being aluminium. When I painted mine I just used Hammerite fom a can even though it said not to and they've been fine though they are now covered in Fly squash and need a good clean. Chap in North West area has an 1850 fitted with silver cowls, looks different!
Mark
1961 Chevrolet Corvair Greenbrier Sportswagon
1980 Dolomite Sprint project using brand new shell
2009 Mazda MX5 2.0 Sport
2018 Infiniti Q30
They already are anodised, hence the problem of getting the paint to stick. All you need is the correct primer...where did I put my non ferrous paint specifier...back in a moment...