HELP - Issues dying PETG - The Foundry - Armor and Prop Making

I am desperate for help. I've been struggling late with dying my PETG visors using idye poly. I end up with a gritty appearance and large black smudged areas. I've used this process before with mixed results and can't figure out how to resolve this problem!!! HELP!!! I use a large stainless steel

Bo Katan Armor - Sweden

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