1. Contact angle is the scientific method of measuring the water repellency of a surface.

2. Feathers absorb oil, become matted, and lose the critical properties of water repellency, insulation, and flight.

3. The composition can give cured coating films particularly excellent in endurance (such as retention of gloss and water repellency under weathering), acid resistance and mar resistance.

4. The waterproofing agent composition is liquid and exhibits remarkable adhesion to various materials, and thus can provide water-repellency, moisture-repellency and water permeation resistance to the surface of various materials.