How to Prevent Paint Coating Discoloration
When you first apply a new brush door, the color may appear darker than the actual paint. This can be confusing — is the paint discolored? In reality, paint discoloration usually refers to the change in the clear varnish layer. Originally, varnish is either transparent or has a very light yellow tint. However, over time, it can turn brown or even black due to chemical reactions. Color paints can also experience discoloration, often showing as a darkening of the original hue.
There are several common causes behind paint discoloration:
1. The ester solvents in the varnish can react with iron containers, especially when exposed to moisture, causing the varnish to darken or turn black.
2. Turpentine oil can produce reddish-brown pigments when stored in iron drums.
3. Gold and silver powders are sensitive to acids and can cause the paint to turn green, dark, or tarnished if not handled properly.
4. Prolonged storage can lead to sedimentation and discoloration, especially if the paint isn't stirred regularly.
Here are some effective prevention methods:
1. For shellac varnishes that are particularly prone to discoloration, always store them in non-metallic containers to avoid unwanted chemical reactions.
2. If using gold or silver powder, add it just before applying the varnish. Avoid mixing it too early, as this can lead to discoloration during storage.
3. If you notice discoloration in your paint coating, check if it's due to a quality issue. If not, thorough stirring before use can often restore the paint to its original condition.
By understanding these causes and taking the right precautions, you can significantly reduce the risk of paint discoloration and maintain the quality of your finish for longer.
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