The high temperature and high humidity environment in summer is the “natural enemy” of automotive painting. As a professional automotive paint manufacturer, we provide an in-depth analysis of common issues such as blistering, loss of gloss, and dry spray during summer construction, along with professional recommendations for selecting auxiliary materials to ensure your paint finish remains as smooth as a mirror even in the scorching heat.
As summer arrives, extreme temperatures (exceeding 30°C) and highly fluctuating humidity pose severe challenges to automotive painting. Without adjusting the construction plan, issues such as blistering (solvent bubbles), loss of gloss, dry spray, or sagging are likely to occur. As an automotive paint manufacturer, we have compiled four key considerations for summer construction.
Paint sagging phenomenon
Paint blistering, blistering on the paint surface
Paint blistering with pinholes
1. Core Tip: Switch to Slow-Drying Auxiliary Materials
In high-temperature environments, solvents evaporate rapidly, causing the paint film surface to skin over quickly while internal solvents cannot escape, leading to “blisters.”
– Slow-Drying Hardener: Delays the crosslinking time of the paint film, ensuring sufficient leveling space.
– Slow-Drying Thinner: Essential for summer construction. It effectively slows down solvent evaporation, prevents “dry powder” during spraying, and enhances the fullness and gloss of the paint film.
2. Adjust Spraying Techniques
– Gun Movement Speed: In high temperatures, increase the gun movement speed appropriately to avoid sagging caused by excessive thickness in one area (as high temperatures reduce paint viscosity).
– Overlap Width: Increase the overlap area of spraying appropriately to ensure the paint film remains wet and prevent noticeable lap marks.
3. Environmental Monitoring and Construction Time Selection
– Avoid High-Temperature Periods: Choose early morning or evening when temperatures are lower for spraying operations.
– Temperature and Humidity Meter: Keep a temperature and humidity meter in the paint mixing room and spray booth. When humidity exceeds 80%, be sure to use anti-blushing agent (moisture inhibitor) to prevent the paint film from turning white and losing gloss.
4. Compressed Air Drainage Treatment
Summer air is humid, making it easy for water to accumulate in the air compressor’s storage tank. If oil-water separation is insufficient, “water-oil spots” generated during spraying can completely ruin the entire paint finish. Before construction, check and drain accumulated water from the air compressor and pipelines.
5. Flexible Flash-Off Time
Although high temperatures shorten the flash-off time, ensure each layer of paint reaches a “finger-dry” state before applying the next layer. Over-pursuing speed can trap solvents inside the bottom layer, leading to later paint film sinking.
Conclusion:
Summer construction is a dual test of product stability and technical expertise. By properly combining our slow-drying auxiliary materials and following scientific processes, you can easily tackle high-temperature challenges and maintain perfect construction quality.
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