iDye Poly Problem, dark spots? RPF Costume and Prop Maker Community

I just finished dyeing a PETG visor for a custom project, and I've run into a weird problem. Two sections of the visor have patches of dark black spots (collected dye?) on the outside, and the dye seem to have scratched/etched the surface as well. Has anyone seen anything like this? I'd rather

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iDye Poly Problem, dark spots? RPF Costume and Prop Maker Community