Why is the sprayed paint not glossy?

[LaKingston]

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.

[MackenzieLee]

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.

[VonPaisley]

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.

[StOlive]

As an experienced car owner, I've encountered several instances of paint discoloration, which ultimately boil down to inadequate environmental preparation. High humidity or cold winds can cause the paint surface to absorb moisture and become dull; insufficient sanding leaves behind rust or stains, resulting in poor paint adhesion. Cheap paints with fewer additives lose their shine quickly after application; rushing the curing process makes it even worse. Now, I emphasize thorough preparation before painting: take the time to sand and degrease, choose a clear and mild day for spraying, and patiently wait for natural curing after application. Combined with subsequent waxing and maintenance, this can preserve the gloss. Simply put, the issue lies in neglecting preparatory work and material quality—don't cut corners or skimp on steps.

[McGemma]

Dull paint often results from material and handling errors. Temperatures below 10°C or humidity over 80% affect uniform drying; incomplete layering—skipping primer weakens adhesion, while lacking clear coat accelerates oxidation and dullness. Old paint or contaminated thinner reduces gloss; skipping post-spray polishing also hinders shine. I recommend controlling the environment: operate at 15-25°C with low humidity, use fresh materials pre-spray, and strictly follow mixing ratios. Post-spray fine sanding and polishing are essential—these details can revive a matte finish. Avoid painting in dusty areas and maintain tool cleanliness.

[LeBradley]

From the process perspective, dull paint often results from errors or omissions in the spraying procedure. Holding the spray gun too close causes runs, while too far leads to uneven thickness. Moving too quickly results in incomplete coverage, whereas moving too slowly causes thick layers to shrink. Incorrect measurement of mixing ratios per manufacturer guidelines or improper thinning affects gloss. Inadequate sanding or cleaning leaves surfaces contaminated with grease, reducing paint adhesion. Insufficient curing time before handling weakens the paint film's reflectivity, compounded by forgetting to apply a clear coat for enhanced shine. My conclusion: Thoroughly prepare surfaces and materials before spraying, maintain steady movement during application, and allow ample drying time afterward. By mastering these fundamentals, gloss naturally follows.