I am making new redwood window casings for a 1946 cabin and treating with Behr’s deck preservative (which I guess has UV inhibitors). Will the redwood color show for a year or two or is the greying inevitable? Also will color last longer in the shade than when exposed to direct sunlight? Or is UV everywhere. Is UV what cause wood to grey? Thanks. Cabin newbie.
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Judging by the arc-shaped marks left by sprinklers, I'd say that water, not sun, is the biggest cause of redwood brcoming 'graywood.'
Your deck sealers work great, but nearly all are wax (pariffin) based, so they will degrade in sunlight in a year or two, max. Then you gat back to 'plan B,' where you essentially paint the stuff to look like redwood again.
Bleaching of the color is due to UV. The problem is that the more transparent the stain, the less UV inhibitors it has. I would recommend using a good semi-transparent stain like Penofin or Sikkens, in a color that complements the wood.