What are the reasons why the paint on automobile sheet metal parts is easy to peel off?

2023-12-12 08:02:51

Due to poor adhesion of the coating film on the surface of the object to be coated or the base coat, scraping the coating film with nails or metal will cause the coating film to fall off, which is called peeling.

Reasons why car spray paint easily peels off

1) The surface pretreatment before painting is not clean, and there are oil, water and other dirt on the surface, causing the coating film to lose its firm adhesion to the material surface.

2) The drying temperature is too high and the drying time is too long, causing the base coating to be overdried.

3) The surface of the object to be coated is too smooth.

4) The coatings are not properly matched and the adhesion between the coatings is poor.

5) Apply the topcoat before the basecoat is dry, forming an upper layer that dries and a base layer that does not dry.

Methods to prevent and cure the paint on automobile sheet metal parts that easily peels off

1) The pretreatment method before painting must be appropriate to ensure that the surface of the object to be coated is completely free of oil and water.

2) Strictly follow the drying conditions specified in the process to prevent over-drying.

3) Use sandpaper to polish the surface of the object that is too smooth to improve the adhesion of the coating film.

4) Choose coating varieties and techniques with good matching properties.

5) Dry the base coat before applying the top coat.