Here’s your spray chrome that works. It comes from a company called SpazSticks. You can buy direct or from Amazon, and I suspect most any hobby shop should be able to order it for you if you prefer that route.
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I’ve used this on lexan with great results so it should be a no brainer on a lightly scuffed poly finish.
I would also recommend you use their black backer. I've tried it with both gloss and flat black enamel and it kinda works, but it looks so much better with their backer. I used it to do chrome highlights (bumpers etc) on toy race car bodies so it can take a licking.
you can get it in spray bombs and airbrush ready. The spray bombs work, but it’s easier to control if you can shoot it.