I’m not an expert, just been painting for about a month and enjoyed a process. I have been suprised how easy it is to create nice metal effects and thought I would share the process.
Painting plastic or resin parts starts with sanding and priming your models. A simple rattle can of rustolum primer is a good starting point.
Next decide on a base top coat. In this first example I used a brown gloss.
One light coat is all that is required, move your hand fast for each pass, turn the model, quick pass again. You want just enough paint to cover the primer colour