Apologies for the delay Brian.
I added the black wash after. A tip that most already know, is to use a pencil eraser to drag across the high edges of the grill. It removes the paint pretty cleanly. I use acrylic Apple Barrel Wal-Mart craft paint.
Did the wheels up using those nice inserts from CG Slotcars
I used Duplicolor universal chrome after I glued the inserts into the wheel. They fit very snug, so all I do is brush a little Hansens Hard as Nails on the inside of the wheel and press them in.
The thickness of this chrome paint has an advantage. It can build up a little on the edges and produces a very smooth contour effect between the outer edge of the insert and the inside wall of the wheel.
I used the same brand Apple Barrel acrylic to drop some red over the center. Just a slightly thinned application with a toothpick or very small brush lets the paint flow down and seal around the center.
Then used a Sharpie to highlight the lug detail. Not perfect but looks ok to me.
And once again my toothpick "lettering".
Close enough for me :)