TOKYO — Nissan on Tuesday showed what it called a “cool paint” to keep people inside vehicles cooler, although the coating is six times thicker, making commercialization a challenge.

Nissan Motor Co. tested the paint on vehicles driving around Tokyo’s Haneda Airport, where there are plenty of unshaded areas that make it a good place to assess the technology. The vehicles with the special paint looked like ordinary cars, but felt much cooler to the touch.

The cool paint lowered the cars’ roof-panel temperature by 22 degrees Fahrenheit and the interiors by 9 degrees, according to Nissan. The cool paint reflects sunlight better and also creates electromagnetic waves that block the rays, redirecting energy away from vehicles. — Associated Press