Supposing that the brand new superstructure was made of primed worn plates, then bolted in place :
To achieve the worn effect, i sprayed RED OXIDE PRIMER, which is a "chippable paint" :
-just paint it
-as dry gently remove it on corners with a water-wet brush
- then rinse under a waterflow, and paint will definitely adhere to surface
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more has to be done to blend together that mess...