I have a metal garage door, the inside suggests it is galvanised, the outside has been painted many times. The last time I rubbed it down, primed flaky bits and used Hammerite garage door paint. It is now passed its best and was wondering what paints were suitable. Currently it is bright navy blue and I'm thinking of a more grey blue this time. Thank you
Assuming the existing paint is sound and well adhered you could simply clean and lightly sand and apply Rust-Oleum CombiColor in the colour and finish of your choice.