Once your colors and flat coat have been applied, you can add a black wash to give the blower assembly some depth and a grungy look. A black wash is black paint that has been thinned to a watery consistency. A brush is used to apply the overly thinned paint over a part in small amounts. Start your black wash with 10 parts thinner and 1 part paint. Apply it to a test part to see if you like the finish. If it comes out too black, then add more thinner. If it’s too thin, just apply a few coats until you get the look you’re going for. You can also pick up a black wash at your local hobby shop if you don’t feel like making it. When you apply the wash, the paint will pool up in the various details in the part giving it a more realistic look. This only works if you have applied a flat coat to the parts because it doesn’t stick to the glossy chrome surface that the blower assembly comes with.
Here’s a great view of what I started with (left) and the finished product (right). I’m pretty happy with the results.
Want a grungy look? Add black wash over flat clear.