After the paint dry film short period of time (several hours or several days) gloss phenomenon known as the slow disappearance of the missing or called inverted light. Outdoor film, after a long-term exposure then lost luster not belongs such a phenomenon. The main reason for the missing light: a. the ladking of Oil, resin and the unblend of polymerization incompatible with each other misconduct; b. Excessive amount of thinner; c. under construction in cold weather or high humidity environment; d. when parching, thinner is not essential to a certain degree on into the greenhouses; e. after praiting encountering the atmospheric smoke; f. Surface handled properly; g. Primer not dry; what cause of powder->> A powder-coating the surface, with their hands after touching the stick in the hands of the phenomenon called powder. Reasons: a. Light Fastness are used in the resin and paint, mistakenly used in the paint outdoors; b. Film too thin, and so on. the process of powder is a slow process. And in the surface of the first coating, each from very little powder, the coating remained under the original state until all the damage so far. In hot and humid regions of the powder coating easier. Why paint cracking » A different size of depth on the surface coating like turtles crack phenomenon called cracking. If the coating cracks appeared after using a long time, this film is the natural aging process. Failure surface coating has to be re-prain are not sick. Due to: a. If the coating on a turtle near the use of crack, this was mainly due to primer with inconsistent one, by coating the outside world role (mechanical, temperature changes) have caused the contraction of. If the long oil alkyd primer paint on the short oil alkyd easy to crack. b. In addition coating species selection misconduct, such as mistakenly modified phenolic or epoxy, such as asphalt used for outdoor painting, and metal surface primer for timber. C. Coatings too volatile, poor adhesion, dry material or excessive amount of drying agent, in the old coating on the continuous repair and finish too many layers, a thick coating, construction of a poor environment, painting, Will not mix well paint coating and so easy to cause cracks. What is spalling » Coating cracks in the loss resulting from the adhesion of paint was separated from the corpus or primer-phenomenon. In the film there often happen peeling off embrittlement and shedding small pieces, sometimes in volumes Paper the coating will be falling off. The main reason for the sick: a, Surface dirty, stained with oil pollution, water, rust or other pollutants; b, Surface handled properly, such as cement, wood inlay on the surface without polishing or painting, and the oil primer in the (southbound)-absorption caused that to upright (this phenomenon in the Glass Base, the vinyl chloride, ethylene and other coatings products in a more) with poor paint adhesion; c. Primer dry thoroughly or primer bright, without directly on the polished face, also easily lead to layer peeling off, under the conditions of high-temperature coating of a falling off easily; Construction of paint, why would rust » the phenomenon have corroded in the painted steel or other metals. This phenomenon occurred in the early time yellow coating thoroughly, and then coating was brokendown, there pitting, corrosion and pitting filamentous. Lacquer surface treatment with inproper mothed(if any rust) coating too thin, water and oxygen easy to penetrate the metal surface coating directly. Broke a pinhole or coating, and so easy to cause corrosion in the film. This is so-called rust coating.