Belt mouldings are a very complicated part with a rubber, plastic and metal all integrated into a seemless component. I always figured it would be the last piece of trim anyone would ever attempt. I've been mulling over how to do it for years thinking I might attempt after I retire in a few years. But I think I'd rebuild originals. Peel all the laminate off and straighten any dings. Then powdercoat them. That's the easy part. Then draw up a mold for the rubber wiper and have it CNC machined from aluminum and polished. It'd have to be very precise and may take a few prototypes to get it perfect because the metal strip has to be clamped into it tight enough that the urethane rubber doesn't leak past where its supposed to bond to the part. Coat with mold release, assemble, then maybe I could use a 2-part mixing gun to inject the material into the mold making sure it oozes out some evenly spaced relief holes on the back side of the wiper that can be trimmed off with an xacto knife. But I'm just thinking out loud if it helps you strategize your own process. Good luck.