Introduction: Paint skinning is a common issue during production and application, referring to the formation of a surface film due to oxidative polymerization. This article systematically analyzes the causes of skinning and provides complete solutions covering drier adjustment, anti-skinning agent application, and packaging/storage optimization.
What is Paint Skinning?
- After opening the container, a viscous rubber-like substance covers the surface while the underlying paint remains uniform
- Mainly occurs in oxidative polymerization type paint systems
Common Causes of Paint Skinning
- Formulation Factors:
- Excessive driers, especially surface-drying promoters
- High content of over-polymerized tung oil
- High pigment and filler content, overly viscous paint
- Packaging and Storage Factors:
- Poor sealing of packaging containers
- Low filling level in containers, leaving large air space
- Storage time too long or storage temperature too high
- Application Factors:
- Prolonged exposure to air during application
- Poor sealing of remaining paint after use
Solutions to Prevent and Fix Paint Skinning
- Formulation Optimization:
- Adjust drier dosage, temporarily reduce or eliminate surface-drying driers
- Add 0.1%-0.3% anti-skinning agents, such as: guaiacol, phenol, catechol, turpentine, butanol, cyclohexanone oxime
- Packaging Improvement:
- Maximize filling level in containers to reduce air space
- Add thinner (e.g., turpentine) on surface to form protective layer
- When possible, remove air and fill with inert gas
- Storage Management:
- Accelerate paint turnover, avoid long-term storage
- Storage area should be ventilated, avoid high temperature
- Store remaining paint in small sealed containers
- Problem Handling:
- Carefully remove formed skin
- Underlying paint can be reused after stirring and filtration
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