What causes small pits after car painting?

[Karla]

It is due to poor craftsmanship. The surface should first be repeatedly sanded with wood sandpaper to remove wood burrs and make the surface smooth. Any residual glue at wall joints and other bonded areas should be scraped off with a knife or sanded off with fine sandpaper. If there are color spots or uneven color distribution on the surface, the surface should be pre-treated for decolorization to achieve uniform color. The details are as follows: 1. Repeated painting: The surface of metal components should be thoroughly cleaned of dust, oil stains, welding slag, and rust spots, then coated with anti-rust paint. If not specified in the drawings, the coating should be applied at least twice. 2. Paint selection: Choosing paint for an air-powered mixer requires consideration of multiple factors such as power type, applicable materials, layout form, processing capacity per batch, type of air-powered mixer, material type, application field, mixing method, and air-powered capacity. For example, applicable materials include liquids, paint, chemicals, food, adhesive, ink, etc.; application fields include chemicals, construction, food, medicine, paper industry, etc.; layout forms include horizontal, vertical, cycloidal, coaxial, etc.

[CarmenRose]

I've encountered this situation before, mainly due to insufficient surface cleaning during the painting process, especially dust, grease, or old paint residue left on the car body. After painting, dust particles mixing in can form small pits. Additionally, if the painting environment has high humidity or excessive dust, dust settling before the paint cures can also cause this issue. Holding the spray gun too far away or moving it too quickly during painting can result in uneven paint application, creating tiny bubbles or depressions. Improper paint mixing, such as adding too much thinner, can lead to uneven shrinkage after drying, forming pits. The key to prevention is thoroughly cleaning the car body in advance, sanding it smooth, and ensuring the workspace is enclosed and low-dust. After painting, don't rush to drive away; avoid touching the surface during the drying process. These small pits may seem minor, but leaving them untreated can accelerate paint aging, cracking, and even rusting. So, if you notice them, it's best to have a professional shop re-sand and repaint the area—spending a little money now can save you big trouble later.

[AmirAnn]

I tried painting my car myself a while ago, but ended up with many small pits, which was quite frustrating. The main reasons were improper operation: I didn't clean the dust off the car surface thoroughly, didn't close the doors and windows properly in the spray booth, allowing dust to fly in and stick to the paint. During spraying, I didn't maintain the right distance, and the spray gun was a bit unsteady, causing uneven paint application and forming tiny pits. Insufficient paint stirring also affected the result. Later, I consulted an experienced technician who advised that pre-cleaning is essential, including using degreaser to remove oils and ensuring a dry, low-dust environment for painting. High humidity makes problems more likely. Using an oven to dry the paint afterward is better. While DIY saves money, lack of skill often leads to rework. He suggested practicing on small areas before attempting a full car paint job. These small pits not only affect appearance but may also cause premature paint corrosion and aging, so timely repair is necessary.

[AshlynRose]

In my experience, small pits appearing after car painting are mostly due to inadequate surface preparation and incomplete dust removal. An unsealed painting environment allows dust particles to blow in, causing holes. Overly thin paint can also leave dimples. Prevention lies in thorough cleaning and choosing the right weather conditions.

[MarleyLee]

I often do DIY spray painting, and small pits are a common issue. The causes include poor control of the spray gun distance—if it's too far, the paint mist disperses and forms small particles. Alternatively, the surface may not be sanded smoothly, leaving debris that gets trapped in the paint layer. Uneven mixing of the paint or high humidity can also lead to pitting. To prevent this, ensure the workspace is dust-free and the temperature is moderate. Before spraying, use an air compressor to blow away dust, and after spraying, dry the paint slowly. These small pits tend to accumulate dust and rust, requiring re-polishing.

[DiMila]

I believe small paint pits stem from oversight in details: surface oil stains and dust not cleaned, impurities mixed in during painting; high environmental humidity or excessive dust causing pits during curing. Improper spray gun operation can also lead to their formation. These small pits are not only unsightly but may also expose metal, accelerating rust and affecting overall appearance. Thorough preparation before painting is essential.