Researcher develops spray-on stealth coating for drones with 43dB radar reduction

A researcher has developed a spray-applied stealth coating made from volcanic rock formulation that reduces radar return signals by up to 43dB, compared to 20–30dB for typical radar-absorbent materials. The lighter, lower-cost alternative could ease integration on military and commercial drones.

The advancement sits at the intersection of materials science and edge hardware, potentially lowering barriers to stealth technologies for unmanned systems beyond traditional defense contractors.