I LOVE GLAZING USING OILS.
I used to use this technique when I painted exclusively in acrylics, but I love it even more using oils. (I've returned to oils after a 30 year hiatus.) It was just easier to use water-based acrylics and the drying time was better. But after being talked into returning to oils by a fellow artist I have discovered the new resin based mediums to be better than acrylics for this technique. I use Liquin Fine Detail (it has a smooth, slippery quality) and Gamblin Galyd Lite (it gives a crystal clarity to the layer). These in combination with transparent colors create beautiful glazes. This is especially useful in my current painting "Tampa Bay Tarpon". I want to create the luminosity and reflection of the fish scales, and by layering various glazes it's is working beautifully. In this photo I just covered the pinfish with another glaze of Ultramarine Blue/Paynes Gray and Galyd Lite. I also glazed over the pinfish that are in shadow adding black to this mixture. Yes, I did add white highlights in the previous step. But I painted over them again. First there were too many whites. It takes away from the effect with too many white reflections and does not have enough contrast. In the next painting session I will add the highlights back in, but I will be more selective in their placement. TIP: When layering glazes I don't apply more then one per day. Much like working in acrylics, each layer needs to be dry so that they do not mix together. And the painting always looks different the next day when the colors are set.