Tamiya iridescant spray
 

What, if anything, do you need to back the above - limited to cans only as no gun... what sort of end result to they give?

http://www.rcsgraphicworx.com/shop_c...iridescent.htm

that will provide a basic insight

Wow, makes good reading thanks, on all topics. I now understand liquid mask... Will google some more images of results later as access restricted here, but that is a good start thank you