Ok, now for the fun part.
Break out your airbrush. All of your paint for this will be over reduced, we want to use it more as a wash than an actual pigmented paint. The black in particular. I am using PPG black in this case and SEM Candy's. The SEM Candy Concentrates are mixed with a PPG mixing base and reduced. You can use DBC500 or any of the clear carriers designed for Candy's.
Step 1.
Start airbrushing your black on the sanded aluminum. Spray in the direction of the grain, but don't worry about even coverage. We don't want that, concentrate the black heavier where the nozzle would be dirtier from soot and crap in real life, along seams, in rivets, etc.
Step 2.
Take your Mr Clean Magic Eraser and start rubbing down the part, again, always in the direction of the grain. This will remove most of the black leaving deposits in the sanding scratches, valley's, rivets, grooves etc.
Step 3.
Now take your Pthalo blue candy, over-reduced as well and spray the area's where the blue should be, look at reference photo's to determine where the metal will blue the most.
Step 4.
Rub down the blue with the magic eraser now.
