The researchers developed a simple and cost-effective method to create superhydrophobic films on insulating materials. These films can repel water very effectively, with a contact angle of up to 151.8° and a low sliding angle. The key to their success lies in the surface structures of the films, which have a roughness of 10.88 μm. When the roughness is less than this value, the contact angle increases with roughness, but it decreases when the roughness is greater. The films can withstand sandstorm tests and maintain their superhydrophobic properties over time.