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If I do a layer of a painting with WMO oil paints mixed with water as a solvent, and then I paint over the top with traditional oil paints (because of more pigment choices, etc..) will this cause an issue? Would the water remain trapped in the WMO paint layer, or will it evaporate through the traditional oil paint layer?
I have read that it takes a lot longer for all the water to actually evaporate out when using acrylics, so is the same the case for oil paints?
Are you aware of any issues with paintings done in a mix of WMO and normal oils in this manner?
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Traditional oil paint is applied over other water-soluble media including acrylics and egg-oil emulsion, so I wouldn't think there would be any special concern with water-miscible oils. As long as the WM oil layer seems dry to the touch, I would not worry about residual water content. Gradual release of water and glycols from an acrylic paint film is important because of the way acrylic paint dries- through coalescence of polymer microparticles. Oil paint "dries" through a completely different process involving oxidation. WM oils do, however, contain surfactants and stabilizers not used in traditional oils, and some of these have been observed to have migrated out of dry paint. This, I would think, might be a more significant concern when layering mediums.
Thanks Matthew. I missed the fact that oils over acrylics works very well and that this is also a water medium.
I take it the conservators are still out on the long term stability of WMO paints/paintings?
I will leave your followup question for the conservation experts to answer, but I imagine that the fact that some ingredients are still undisclosed as proprietary secrets doesn't make it any easier.