Painting Outdoors When painting outdoors, also known as plein air, windy conditions can make your easel an unsteady work surface. In such cases, the easel may be secured by suspending a large stone from the apex of the tripod, or by tying the legs to pegs pushed firmly into the ground. There are many other factors to consider as well. Painting outdoors with Acrylic Paint is not recommended as it dries very very quickly in the wind. In some climates acrylic paint can dry on the brush while applying causing some very un-desirable strokes. Oil Paint is the most recommended as it takes days sometimes weeks to dry. Watercolors dry quite quickly outside as well but this can be useful to specific watercolorists.