Thanks guys! For the chassis highlights, I like to use a product available at craft stores called Rub N Buff. It's a pastelike metallic product that comes in a tube and can be lightly spread to create a metal like effect. Go easy with it though, a little goes a long way. You can use your fingers or a cotton swab. Below is a picture of the product and another chassis I used it on.
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I also used some of it on the engine bay and surroundings....
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