Do you do a paint suitable for galvanized metal ? Just an 8x4 sheet i've fitted to a combine harvester Would need to be mid to dark green (John Deere green)
Assuming the galvanised metal is clean, dry and sound we can recommend Rust-Oleum 3302 CombiPrimer Adhesion followed by Rust-Oleum CombiColor Original. This is available in many RAL and BS colours in a satin or gloss finish.