STEP BY STEP
Before applying the surfacer, I sprayed all the etched parts with Mr. Metal
Primer to improve adhesion of all subsequent coats.
I sprayed the engine body including its cylinders
with Gunze Silver from the Super Metallic line,
specifically Super Fine Silver SM01.
As a base color, I chose Mr. Black Spray Putty Finishing Surfacer
The exhausts were sprayed with a combination
of highly diluted AK Interactive Bronze and
Brass metallic paints in an irregular pattern.
If this effect is overdone, it can be toned down
with heavily diluted black paint. The final step
was spraying the exhaust pipe with Gunze GX114
The inner surfaces of the parts were painted
light grey according to the instructions,
using Gunze C325.
The uniformity of the basic spray can be broken up via lightening the gray color by adding a few drops of off-white C069 and creating a mottling effect.