you should get a spare piece of plastic and test it thoroughly first.
it sounds like kind of a weird idea. tons of experimenting probably necessary. good luck.
edit: didnt realize this was the crackle paint. look into other crackle mediums.
i
def would not go with that
GW crap. Kroma crackle i hear is very very good. pricey though. you can also tint it whatever colour you want.
http://www.youtube.com/watch?v=Yd5A0RD_CHs