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Will Simichrom damage any resins, plastics, acrylics?
Nope, add some elbow grease and it will transform resins, plastics and acrylics into nice shiny things.
It is good for removing light scratches, for deeper scratches I use 1200-1500 grit wet and dry abrasive paper before polishing.
Be careful using Simichrome near any plated trim, it will quickly remove the plating, although I use it lightly on rolled gold caps for excellent results.