[Bob Carriere]

.... that is a delicate issue.....

It may have more shine than flat flat OD.....

Can you get it in gallons and add a flatening agent....? and use gasoline as thinner before spaying with a gun........?

You would need to have a sample of flat green to really compare.

I would be tempted to use it as a basic primer to be topped off with the proper flat OD shade..... Rustoleum as a good reputation for properly sealing stell parts.

Bottom line it is your truck...... work on getting it running and useable.......and if the same shade is used on the full truck it will look good.

Bob