As an urbanscape artist William Wray suggests “...spending as much time outside as inside in order to capture true color and light...,” I load my car with my sketching and painting stuff as well as a digital camera then drive away wherever I want to go that weekend unless it’s raining. It doesn’t mean I go outside every weekend especially in fall and winter in NW. You know what I mean...
“Plein Air” is ultimate studies for a painter whose subjects are mainly landscapes. It takes different kinds of skills from studio painting due to specific constraints, such as canvas size, time you can spend on-site, changing light, and so on. I regularly use 12”x16” stretched canvas for plein air. I made a rack that can carry three wet canvas of this size. If you go to a bigger size, you need to negotiate yourself to finish painting within the time you have there. I don’t spend more than two hours for one session. The size is appropriate for me to finish it with my current skills.
“Plein Air” is wet-in-wet in nature. You can’t wait until a layer of painting dries up before putting another layer over it. Since lighter colors are more opaque than darker colors in general in case of oil painting, you want to put darker colors first.