Definition- The dullness of a surface, often as a bluish cast, that forms on the surface of a dried film. This effect forms after a coating has dried, sometimes many days later. Can often appear as a film on the surface that can be wiped away. After wiped, will often reappear later.
Causes of Bloom /Haze of Lacquers- Inappropriate/excessive catalyst added to a product.
- Inappropriate/excessive addition of additives to a product.
- Incompatible products used together.
Prevention of Bloom /Haze of Lacquers- Catalyze at the correct ratio.
- Use fresh, uncontaminated products.
- Do not use unnecessary additives.
- Always use compatible products.
Possible Fixes for Bloom /Haze of Lacquers- Strip and refinish.
- Sand and recoat.
Questions to Ask- Has the product been altered in any way?
Thinners, retarders, colorants, additives, any other additional adds to the product? - Were there any products (water based, oil based, glazes, stains)used that may have left residual material behind?
- What are the environmental conditions, both during application and cure?
- Have things changed, including equipment and personnel?
- Are the products being used compatible?
- Are the products being used from the same manufacturer?
- Was there any preliminary testing of this system before it was used on a larger scale?
- When in the finish process did you notice the problem?
- Has this problem happened before?
If so, what were the conditions at that time, especially compared to the current conditions? - Has the product been catalyzed properly?
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