The peeling of paint surface refers to the loss of adhesion between the paint surface and the car body surface or between the new and old paint surface as the paint film dries and cracks, resulting in the peeling of the surface layer of paint or fish phosphorus pieces; Or the adhesion between the paint surface and its underlying surface is completely lost, making the paint surface fall off in a large area. Last time, I Shared with you how to prevent car electrophoresis paint film particles? So this time by the electrophoretic paint factory feifei professional introduction of the cause of car coating off and preventive treatment measures.
The reasons causing：
 （1）The surface before spray painting is not completely clean, to be sprayed surface moisture or moisture, oil, surface oxide and dust; The chemicals after cleaning the surface are not scrubbed clean; The paint leather that should be removed is not cleaned.  
 （2）The surface to be sprayed is too smooth, resulting in low adhesion.
 （3）Before, hind lacquer layer did not use identical qualitative lacquer, or primer paint film is excellent, make lacquer face not easy agglutinate.
 （4）The temperature in the paint room is too high, or the baking time is too long or too short.
 （5）Spray paint layer is too thick or the previous layer of paint is not dry spray a paint.
 （6）Paint layer between the powder or stain, preventing the combination of paint layer (in the wet condensation of the place or chemical smoke bigger place spray paint, easy to cause a large area of paint surface to fall off).
Prevention method：
 （1）Before spray painting, spray surface to do serious cleaning treatment, to be sprayed surface clean, dry.
 （2）Excessive smooth surface to be sprayed, to use sandpaper grinding, so that it has a certain roughness.
 （3）To strictly control the temperature and time of baking paint, according to the technical conditions of coating varieties strictly executed.
 （4）It is necessary to consider the compatibility of paint layer and enhance its adhesion. The form a complete set of coating should accord with certain criterion, want to have certain solubility at least, it is the solvent of outer coating should be a few stronger than bottom coat commonly, can produce weak swelling to bottom coat film, can combine thereby rise, and cannot match two kinds of different paint to rise at will spray.
 （5）When the old paint face that changes serious to pink undertakes besmear, want to add another reinforcement layer, to especially hard epoxy paint face, common solvent makes its bate very hard, must try to repeat spray paint after processing, ability is adhered firm.
 （6）In the primer has been fully dry to be sprayed surface spraying vinyl chloride paint, should not wait until the previous layer of vinyl chloride paint film completely dry and spray a layer, such a ability to strengthen the adhesion between paint layers, otherwise, will be due to the poor solubility between paint layers caused by peeling or whole off.
 （7）In chemical industry smoke or field environment, should use quick dry paint to shorten spray paint time, construction in damp environment, should wait for spray surface water vapor to dry after spray paint, or paint film layer after dry.
The content that the above introduces, it is the reason that car coating falls off and precautionary treatment measure, hope can help everybody.