I got ta brige fer sale for a gud "by it no" prize you mite be inturestd. U see, my cusin oned it and he just dyed en a Cobra akkicent, so he no longer has a ned for it. U jus need to muv it
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In all seriousness, cameras, light, and glossy surfaces all interact in endless combinations. It's highly unlikely that a spray-on product would provide any fool-proof protection.
One thing is clear in a number of states. Any tinted or optically treated license plate cover is illegal, and in a number of places, they will generate a stop from a police officer.
You're far better off, not running a red-light in the first place. But, putting one of those on, greatly increases the odds of getting "busted" over the lesser odds of getting busted by the camera.