The wet-on-wet painting with oil is so called because it is possible to apply a fresh (wet) color over a color that has not yet dried (wet). This application process should be used with great care just because the color base is not stable and the colors can mix too much.
In the search for light and dark the different shades are flanked. In fact, you have the color inside defined edges and then fade to get the contrast. With the wet-on-wet technique instead, the overlap of the color enhances the nuances and the thickness of the relief on the canvas. The technique is typical of the Impressionists.
Painting wet on wet with watercolor has few but fundamental rules that if you learn can be applied on different supports. This technique allows obtaining brilliant and harmonious results. With this method, the painting is performed in a single session, with a “single” layer that usually is opaque or semi-opaque.
Usually you create a contour with the lapis. The colors are then spread within the shape we have created or the whole sheet. The wet sheet will make the drafting of the color very simple. Thus a defined and enveloping color will be obtained, rich in nuances even if used singly. If the canvas is rather large, it is advisable to wet it only in the part that you think you can paint. Only later will the other spaces be wet.
With brushes and spatulas the color is distributed with the addition of other water.
Colors can be applied instinctively or they can be blended with a brush or rubbed to achieve the desired effect. The sheet on which it is painted can be inclined, letting it follow the lines drawn by gravity.
For outdoor views it is one of the best techniques. The technique requires having a clear idea of what one has in mind to paint.