...for metal or wood
Majority of the cockpit in Boeing 737 is painted on iron gray, RAL 7011. You can easily order it somewhere on Internet, however "Colours: Dark Gray Mat" from Castorama is also good. It's cheap and perfectly matches the other elements painted on RAL 7011. I suggest to take a can of 2.5 liter.
...for metal\plexi surface
You may also need spray for painting small plexi elements or metal parts e.g. screws. Leroy Merlin or Castorama...
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