Abstract
Recently, such house with long-term durability has been desired in Japanese housing industry. Narrowing down the target to external wall material, we've focused on ricin finish coating which is cheap and commonly used as a finish coating material for external wall material. Ricin coating is a method to spray coating material mixed with aggregate using a spray gun as a paint finish for external wall material. With such advantages as indistinctive unevenness due to its rough and even finished surface as well as cheap price, it has been widely used. In ordinary ricin coating as it stands now, however, there are drawbacks such as color degradation, cracks on the surface and short expected life in waterproof performance. In order to improve durability of ricin coating, we've examined durability of ricin coated film by further applying a coating agent on it.
