While in Eastsound on Orcas Island, I found Smith & Speed Mercantile where they sold Milk Paint, a new and interesting water-based medium that I'd use again. I chose marigold, snow white, and soldier blue.
Maybe Smith or Speed said it was a kind of old fashioned paint that would work on outdoor chairs, to weather with more color. We're talking weather: sea gales and driving rain on occasion or steeped in sun.