So you’re not a paint mixologist and you don’t want to try overspraying a nicely done scheme with a light mist of gray or off-white to replicate a fading paint effect. Why not do what paint does…remove and scuff it slightly!
One of the ways you can fade a paint scheme to make it look worn is to start with the appropriate base color…such as a NMF, aluminum will work. Then apply your paint scheme such as I have here. Once the scheme is applied and cured, give it a light sanding to etch away the paint to give it a faded and worn look.

I used a sanding block from Alpha Abrasives. USE A LIGHT TOUCH!
Once that is complete you can make the panel and rivet details pop by using a water based marker…such as this one. I used Gray as my chosen color but you can use what ever color you want/need to get the desired contrast.
You’ve seen me do this same technique on NMF surfaces. As I stated then it does work for colored schemes as well. I used Model Master Enamels here but this technique can be used on acrylics too. Give this a try on a test mule to see how it works for you.
If you want you can do some corrosion control by applying paint blotches as if someone used a rattle can to seal up the areas showing corrosion. A worn workhorse will have just such applications…usually by a new troop and spray cans from differing manufacturers lot numbers! Like this guy painting a piece of support equipment.











