How to use Chrome paint...

[Monkeysmate]

My lad has his body shell neon green with orange "drips" done with a vinyl mask.
I'd like to do something to make the drips a bit more interesting, and was wondering about trying to shadow them with chrome or something.
This is purely for my own entertainment.. he's quite happy with his shell as it is.
So my questions are... Has anyone got any better ideas?! And failing that, how does one use Chrome?
What happens if I back Chrome with neon green?
And what would I do if I wanted proper Chrome? Do I just use Chrome backed with white?
Thank you
Tim