Thanks for your ongoing help dampeoples!
When I said add white, I meant to the hot plastic to have a white bait to paint over. It would make the plastic white and take care of the belly, then do my painting over that.
I'll definitely be airbrushing. I wanted to use a silver coat for the upper two thirds of the trout as the base and then spray the back green. Lurecraft has a good green pumpkin color but I can't find silver...maybe clear paint mixed with fine silver flake would work?