It's very subtle, the change isn't as dramatic either. Black or a dark colour shows it off really well, essentially though these paints are just a chameleon type pearl in a carrier, while wet the carrier looks white but it dries clear ( a bit like PVA glue ), so all you're left with is the pearl.
If you want to use this as you've said I'd highly recommend doing some tests on scrap lexan to see what can be achieved.
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