Definition- An effect of color change, either wood or coating.
Causes of Discoloration- Iron (or other metal) contamination in the coating.
- Over catalyzed product.
- Exposure to heat of the coating, finished product, or both.
- Exposure to UV light of the coating, finished product, or both.
Prevention of Discoloration- Eliminate the contaminant.
- Catalyze at the correct ratio.
- Do not expose the material or finished product to heat or UV light.
- Use a UV inhibitor additive.
Possible Fixes for Discoloration- 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?
- What is the humidity, dew point, air movement, and temperature of environment and materials?
- 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?
- What was the container the product was catalyzed in and/or used from?
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