The anti-theft door paint must be strict degreasing rust before painting. Before the production of skim, pH value, total alkalinity in the scope of the technical requirements should be carefully checked. Skim finish you should thoroughly clean the surface, and carefully check the skim effect.
Iron and steel surface from the dust coating adhesion is bad. Such as acid rust will not only pollute the environment, and the formation of corrosive effect of residual layer and substrate together. Phosphating, coating, (non volatile acid) available phosphoric acid as raw material, adding surfactant, corrosion inhibitor, degreasing and derusting in one step.