Need help creating a battle worn look for a vinyl wrap background! Help

Need help replicating this look on a car vinyl wrap background.. not like a random distress look, but adding the dark accents on the curves of the vehicle..  I’ve tried multi layers and transpancy tool but I just can’t get it to look right..im new to graphics design so any help is appriciated..  any ideas , maybe there is a tool Or technic that would help?