Hi, many car interiors have stained wooden parts, mainly steering wheels and dashboards. The most common ways to simulate wood on plain plastic are replicating the grain with a pointed brown pencil or using artist's oil colours. I prefer a very quick and simple technique that I am using for decades.
The results look like this:
First paint the later "wood" surface gloss orange. Only here I use acrylic paint because it dries quickly and will not be attacked by enamel paint. Let it dry thoroughly.
Then mix some solvent-based gloss clear with a small amount of gloss dark brown. Find out the best relation yourself, 10:1 may work.
Apply this mixture with uneven strokes onto the orange surface. Because the clear and the brown will never merge properly surfaces as shown above are generated. To a certain extend you can vary the appearance by choosing a pointed or wide brush, a stiff or soft brush, parallel or erratic strokes.
Try on a piece of cardboard. It may sound ridiculous but it really works.
Edited by Plastheniker, 11 February 2014 - 01:28 PM.