Apparently some German company has a paint that absorbs radar.
gizmodo.com...
>>A German inventor has developed a paint called AR 1 that can hide a vehicle from radar, and most importantly, "all militarily relevant
frequencies." How it works is unclear, though one test researcher proposes it's either by reflecting radar waves in a pattern so they cancel one
another out, or by utilizing microscopic magnets to absorb radar radiation. And no, it won't get you out of speeding tickets.
We spent how many billions on stealth technology