Saw a can at Walmart for 5 dollars, so I figured why not.
Here's the stuff I'm talking about.
Here's a picture w/o any flash. Left side is with the stuff on, right without. Really isn't all that noticeable.
Here's a flash picture from a distance of about 6-7 yards. Left is with, right is w/o.
Had a laser pointer laying around so I tested that as well. Wavelength: 630-650. Not quite close enough to 904nm, but enough to give an idea.
Hitting the sprayed side.
As you can see, there is still enough return, but it seems to be cut substantially.
I don't know how much plate covers cut, but I figured this might be an option for those who are afraid of a cover ticket. The only downside is that this stuff does accelerate the process by which the plate gets a "dirty" look because of all the stuff sticking to it.
Technically, this stuff is meant to be sprayed on the front end of your car, then washed off a couple days later. Also says on the can that it's not recommended to be used on headlights; so I guess that only leaves the plates.
I've also used the other color, which is a matte gray. Shot my sister's car with a PLII. I have some pictures, but I don't know if I still have the results. Been putting off posting the results ops: