Nowadays, the scope of application of sheet metal shell processing parts has become more and more extensive. Among them, painting is a process we all involve, but due to the different uses and needs of products, in the process of sheet metal shell processing, each manufacturer treats paint marks differently. So do you know how to do a good job of painting marks when sheet metal shell processing? The small edition of Sheet Metal Processing manufacturers will introduce to you next.

When processing the sheet metal shell, the treatment method of painting marks:

Problem 1: The topcoat around the dressing part of the sheet metal shell processing bulges into a ring.

This is because the substrate is not fully hardened, resulting in the absorption of the topcoat. The sandpaper is too coarse and the topcoat uses an inappropriate thinner. Parts repaired with atomic ash or filler ash are not properly primed or sealed before spraying the topcoat.

Prevention: The sheet metal shell is processed and polished to the repaired part until the metal layer is exposed. Solvent tests are carried out on the edges of the exposed paint layer with a diluent. If the paint softens, the paint layer must be sealed. Atomic ash and eye filler can only be used on exposed metal, not on the original paint surface. Use appropriate sandpaper. Make sure all preparatory materials are completely dry.

Remedy: After the sheet metal shell repair material is dry, smooth the damaged part, isolate it with primer material, and then spray it again.

Problem 2: The surface of the sheet metal shell processing has some dot protrusions.

This is due to the papillary line under the fingerprint, the substrate is not sufficiently dry or clean before spraying. The pores/pinholes of the substrate are not sanded or filled before spraying. The polymer material is not properly isolated during spraying. The temperature varies during spraying, resulting in polycondensation (shrinkage).

Prevention method: The sheet metal shell processing manufacturer makes sure that all preparatory materials are dry. Carefully clean the substrate with a silicone remover. Polyester material should be isolated before spraying topcoat.

Remedy: polish the defective area and then re-spray the sheet metal shell.

In summary, it is the treatment method of spray paint marks during sheet metal processing of chassis cabinets. It is hoped that through our introduction, the problems that arise can be solved well, and the spray paint marks can be treated to ensure that the sheet metal shell processing parts can obtain a good spray paint appearance.