Why does car paint fall off
The problem of car paint falling off refers to the loss of adhesion to the substrate due to the cracking of the paint after the car is painted, and under the effect of external forces, polyurethane paint falls off in small pieces or on a large scale. Falling off can also be divided into several types: small pieces falling off, large videos falling off, and a single piece falling off.
Today, the editor will give everyone a detailed introduction on how to prevent car paint from falling off. So, what caused the problem of falling off?
Reason 1: Excessive smoothness on the surface of the coating can cause the problem of polyurethane paint falling off.
Reason 2: The metal surface treatment of the substrate before paint construction is not very good, containing oil stains, wax, water, dust, chemicals, etc., or the metal surface treatment is not immediately followed by construction.
Reason three: Spraying paint or topcoat before the bottom layer is completely dry can easily cause a problem of falling off.
Reason 4: Poor selection of topcoat, high strength of topcoat, and slippery surface all result in the loss of necessary adhesion between the topcoat and the center of the paint, resulting in the problem of falling off.
What methods can prevent the problem of paint falling off?
1、 Before construction, the surface layer of the substrate should be thoroughly treated using appropriate methods and any waste left during cleaning should be eliminated.
2、 Choose a paint with strong adhesion and wettability for the topcoat.
3、 If the surface of the substrate is too smooth and clean, appropriate treatment methods should be used before engineering construction.
4、 Wait until the bottom layer of paint is completely dry before spraying paint and finishing coat.
5、 Strictly follow the engineering construction statistical data provided by the paint manufacturer for engineering construction.
Article source: Automotive repair paint http://www.m.zjlicheng.com
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