This is my baremetal finish F-100.  

Here's a how I painted the engine bay.
   F-100 Super Saber model kit engine bay outer surface painting guide:

• 1.Silver in basic with transparent spray after the silver air-dry.

• 2.Before the step 1. The silver paint(70%) should add a little of
     brown(20%) and flat black(10%), then add arsenic trichloride liquid for
     plastic model.

• 3.Using the small caliber painting gun to paint the light gun-smoke on
     the engine bay block.

• 4.Lightly wiping the "silver area" with cotton tips.

I hope you enjoy it.

Thomas

Lt. Colonel Thomas Fu
Armed forces
Republic of China