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Uhm, would this work on a car to block reflectance of radar
waves?

IIRC, someone already thought of that, and the Pentagon shut
him down.

You'd use this paint on top of the primer coat, and maybe
sprinkle in some nano-scale antennas grown on tiny crystals.

They'd absorb the radar and re-emit it on lower frequencies.

Thus, no radar bounceback.