After a period of use, due to the influence of various environmental factors, the coating performance and service life of the color coated plate will be reduced, so it needs to be recoated. The most basic requirement for recoating coating is to have certain adhesion with the original coating and better durability. The outdoor color coated plate can be divided into three categories according to the use environment, the first category, which is used in the natural environment and requires certain anti-corrosion effect. For example: the construction site under construction is isolated by using color coated plate; the second type, which is used in the natural environment, has certain corrosion resistance and appearance effect. For example: the movable plank house built outdoors; the third type, which is used in some harsh environments, requires a certain anti-corrosion period.

Adhesion on different color coated plates to determine the coating system for re coating of color coated plates. Polyester amino system coating surface contains a large number of hydroxyl and amino groups, and most of the building color coating plate is semi gloss coating. The coating contains a large number of fillers or extinction powder, which presents a certain roughness under the micro level. It is easy to hydrogen bond with the groups on the repair coating and achieve dovetail wedge effect, so the adhesion is strong.