How can car paint crack during the testing process?
Release time:
2021-08-25
In the entire process of automotive paint engineering, various problems can arise if one is not particularly careful, leading to less than perfect construction. One common issue is paint cracking. How does this happen? Cracking refers to the appearance of extensive, fine hairline cracks on the surface of the coating after the paint has dried for a period of time. These cracks can eventually develop into larger fissures surrounding the entire painted layer. So, what are the causes of cracking and how can it be prevented?
In the entire process of automotive paint engineering construction, if you are not particularly careful, various problems will arise, resulting in the construction not being perfect. At least paint cracking is one of the common problems. How does this happen? Cracking refers to the appearance of extensive fine cracks on the surface of the coating after spraying paint for a period of time. These cracks will eventually develop into larger cracks surrounding the entire paint layer. So what are the reasons for cracking and how can it be prevented?
1. Degreasing
When paint is sprayed on a surface that already has cracks, we need to be careful with the substrate during the degreasing process.
2. Drying agent/Paint thinner
If too much or too little drying agent is added to the component products, when adding drying agents or paint thinners, it is important to rely on the appropriate scale and mix according to the correct ratio. If too much paint thinner is added to single-component products, it should rely on the appropriate scale or viscosity and mix according to the correct ratio.
3. Spraying
The topcoat product has not been sufficiently mixed, so all coating products should be thoroughly mixed before spraying. If the base coat is sprayed too thickly, during construction, it is important to avoid spraying too thickly and control the thickness of the coating to a maximum extent. If the sealing coat is sprayed too thickly, usually one to two thin layers of transparent sealing agent should be sprayed. If the paint is sprayed too thickly, it should be sprayed according to the recommended height, using the appropriate spraying technique to avoid excessive spraying. It is especially important to remove defective coatings and respray.
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