The dangers are that shrinkage of the Lacquer Glosscoat may pull the Pollyscale off the surface, or that the solvents in the lacquer will attack the acrylic.
Whether or not the first happens will depend on how well you cleaned the plastic surface before you applied the Polly Scale.
Whether or not the second happens will depend on the solvents in the lacquer. The only way to determine that, short of prying it out of the manufacturer by main force, is to spray a piece of clean scrap with Polly Scale, allow it to cure, and they spray the lacquer over it. If it works, the only thing you have to wonder about is whether or not you got the plastic clean enough.