The reasons for the peeling of the coating can be divided into two broad categories
1. The adhesion between the coating and the substrate or coating is lost.
2. A single coating inside the loss of polymerization force.

The reason for the interglacial flaking
1, coated substrate or coating surface by oil / water, airtight liquid and other foreign matter pollution;
2, overcoating, coated substrate or coating surface has been condensation;
3, between the coating more than the coating interval;
4, between the coating is not matched, such as alkyd finish painted on acrylic paint; alkyd finish painted on zinc-rich primer;
5, before re-coating, the front surface of the coating surface of the free amine did not clear;
6, a spray coating less than the provisions of the minimum provisions of the film thickness.

Avoid the method:
1, to ensure that the surface is coated clean, dry and no pollutants;
2, the construction, the steel plate temperature should be greater than the dew point temperature of 3 degrees; when the temperature below 0 degrees, you can use transparent plastic;
3, material film + hand press method to check whether the surface of the substrate thin ice;
4, in strict accordance with the requirements of the product specification construction;
5, to ensure that the coating supporting the rationality, correctness; zinc primer can be sealed with epoxy primer and then painted alkyd finish;
6, if found free amine, before re-coating can be used 60 ° C hot water cleaning;
7, according to the provisions of the minimum film thickness spray.