Why is the sprayed paint not glossy?
3 Answers
After the car is painted, dimples and lack of gloss are caused by paint being too thick or the temperature being too high. The paint is sprayed onto the car body in fine particles, and the paint adhering to the body needs time to flow and bond together to form a smooth paint film. Here are more related explanations: Precautions for painting: 1. If the paint concentration is too high, the granular paint adhering to the body will cure before forming a paint film, resulting in an uneven dimpled surface. 2. If the external temperature is too high, the thinner in the paint flying toward the body will partially evaporate before the paint contacts the body, increasing the paint concentration upon contact. The paint will cure before forming a smooth film, leading to an uneven dimpled surface. 3. If the car body itself is too hot, the paint adhering to the body will cure before the underlying layer forms a smooth paint film, resulting in an uneven dimpled surface. 4. If too much hardener is added, the paint will start curing very quickly after flying toward and contacting the body, before forming a paint film, leading to an uneven dimpled surface. A dimpled paint surface will appear dull and not glossy.
I remember the last time I spray-painted my car at home, the entire surface lacked gloss, and the problem was that I didn't pay enough attention to the details. Holding the spray gun too close caused the paint to pool and form spots, while spraying from too far away resulted in uneven coverage. I also got the paint dilution ratio wrong, making it too thick, which led to a rough finish. The humidity was particularly high that day, and moisture in the air mixed into the paint layer, leaving it looking dull. The low temperature slowed down the curing process, and since I didn’t apply a primer for protection, the surface suffered. My old spray gun had a clogged nozzle, affecting the atomization. I also neglected proper surface cleaning—dust and grease reduced paint adhesion. Later, after sanding, cleaning, and choosing a drier day, the results improved. DIY spray painting requires patience: sand the surface smooth, degrease with alcohol, test the paint mixture in a small area, and finish with a clear coat for shine.
In our auto repair circle, we often encounter cases where the paint isn't glossy. The most common issues are spray gun technique and environmental factors. Nozzle clogged with impurities affects paint film uniformity, unstable air pressure causes scattered spray that can't achieve smooth coverage; operating in humid or high-temperature conditions makes paint dry too quickly and lose gloss. Additionally, the mixing ratio must be precise - too much solvent makes the paint film appear dull after drying, while too little makes it thick and difficult to spray. Surface preparation before painting is crucial: oil residue left on sanded steel panels can cause bubbling or orange peel effect. We recommend regular spray gun maintenance, maintaining a spraying distance of 10-15 cm, working under humidity below 60%, and applying clear coat after painting to enhance reflective effect. Remember to strictly follow product guidelines for each spray job - don't cut corners.
