Hydrophobic effect of coating depends not only on its own surface energy, but also the surface rough
ness. The hydrophobic coating was prepared by adding hydrophobic additives to the coating to reduce the surface energy, and controlling spraying process to improve the surface roughness. The effects of types and amounts of hydrophobic additive and surface roughness to hydrophobic property of coating were studied. The results show that the contact angle can reach 139 with good hydrophobic effect when the amount of hydrophobic additive is 5%, and the coating has slightly rough surface.