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There is a window in our kitchen, right above the sink. The sill often gets wet, obviously. After about 14 years of getting wet, the finish on the sill was peeling and there were slight splits forming in the wood, as well as some staining. So I took on the task of refinishing it.
Sanded to the bare wood and to 220 grit. Applied a generous coat of Minwax Golden Oak stain & sealant, which, coincidentally, matched the rest the windowframe as well as the cabinets. The next day I did a second application of the stain & sealant. About a week and a half later I brushed on two coats of Minwax Helmsman spar varnish.
Now something odd is happening. The color of the sill is fading. The window gets indirect sunlight, in late afternoon. When it was first stained, the refinished portion was indistinguishable from the rest. Now there is a distinct difference. It doesn't really matter that it's fading, but the question remains: Why? How could this be prevented in situations where fading would be unacceptable?