Charged Raindrops Emit Microscopic Lightning, Eroding Protective Coatings

Scientists have shown that water droplets carrying electric charge can damage protective paint and other coatings by producing tiny electrical discharges upon impact. The phenomenon, described as microscopic lightning, occurs when raindrops strike a surface, releasing bursts of energy that erode the coating layer. This newly identified mechanism offers a plausible explanation for the gradual weathering observed on cars, bridges, buildings, and other exposed structures. By revealing a hidden source of degradation, the finding points to a new direction for developing tougher, more resilient coatings. Researchers suggest that incorporating materials resistant to micro‑discharge damage could extend the service life of automotive finishes, structural paint, and other weather‑exposed surfaces.