Yellowing
Development of a yellow cast in aging paint, most noticeable in the dried films of white paints or clear varnishes.
Causes of Yellowing:
- Alkyd/oil based paints, because of their curing mechanism, tend to yellow, particularly in areas that are not exposed to sunlight.
- Oil-based varnishes start with an amber cast and will darken with age.
- Heat from stoves, radiators, and heating ducts.
- Lack of light, for example, behind pictures or appliances and inside closets.
- Tobacco staining or other environmental contaminants.
- Moisture.
Solution:
- If there are no other problems and the yellowing is not offensive, repainting is not necessary.
- Repainting using a latex paint will reduce the amount of yellowing, but if the environmental conditions that caused the previous coating to yellow continue, any new coating may also yellow
- Apply a stain blocking primer to lock in and hide any yellowed appearance before repainting
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