This is more of a long story than a tip... A very long time ago I built fiber glass boats in FLA. I was a builder not a painter, but the gel coat man ran off with some sweet thang see? So yours truley got to spray the mold. With a glass boat you wax the mold 40 times before you add the paint (Gel coat) which is done before there is a boat. The Order was for a bright big metal flake candy red. The mold was black so I could see the red pretty good, but just as I was finishing the first go round, and getting a bit of critque from a fellow builder about light places, the boss showed up with the would be owner....
The guy had changed his mind!!!!!! He wanted a bright electric blue!!!! and in the same flake size. That size is like what is seen on some bike helmets really large flakes, and the colors are transparent.
My boss took one look at the red, and shook his head. Then to my amazment said to go with the blue right on top of the red!
I figured it was a scrap job and we were gonna have to muck out the mold and begin over. You can't blow the mold with out a boat in it....(force air in to pop the boat)
So I shot the blue as I was told, and then built the boat. I at the same time had to do the deck mold, and as close as possible do the exact same thing.
Everyone, but the boss and the customer was curious about what we were gonna get. Both of them were thinking Blue metal flake, but they were not labor....
After that I built the rest of the boat into the paint job as normal, which takes a few days for a 16" speed boat.
The big day came and we blew the mold, and popped the hull first. One guy said out loud "I'll be damned it's blue! Well 2 seconds later another guy piped up it's purple! I was still lifting and could not see, but when I could back off I saw red!
About then I was having a fit, when another guy walked by and was awestruck! He began yelling that the boat was changing colors as he walked, and he backed up still looking hard.
What had happened was the red and the blue did not mix, but the light hit each color and reflected each color, and depending on where you were, and what the light was like the boat changed these 3 colors.
Well the Boss was Pissed, untill the customer popped in. The customer took 1 look and was delighted. I think he wanted red, and his wife wanted blue or something like that, and so they both got what they wanted. It was near to perfect as I could ever have hoped for..... Maybe if you feel "Frisky" and wanna play you might adapt this idea...