I'd always been taught that you couldn't paint over oils with acrylics because of adhesion problems and drying problems leading to cracking. Recently while looking around the net I came across a Gnome DVD with Dave Dorman showing how he paints. Apparently, he paints acrylics over dry oils.
Are there any rules to this and will he run into problems later on? I plan to buy his DVD just because I'm so intrigued with how much he mixes his media. In the free video you can watch he even uses markers over the oils. I plan to try all this but thought some here may have tried before.
basically the layer of acrylic is only sitting gingerly ontop of the layer of oil. Eventually (who knows when) the layer of acrylic will start to peel. This happened to one of my teachers. Also I know a few artists who have exploited this to make translucent rolled paintings. They paint an acrylic painting on top of an oil ground and when it is dry they peel it off.
If you want your painting to last, its a very bad idea.
Please be clear that where the intended product is for an "illustration" job, it really doesn't matter a damn whether the painting is "archival", because the final product is a photo/scan/digital image capture, and as long as it hold up long enough to achieve that, then thats all that really counts - a very different consideration from a "fine art" painting which should be able to hang on someone's wall for at least the next 50 years, and preferably a lot longer.
...as long as it hold up long enough to achieve that, then thats all that really counts...
That doesn't justify wasting your efforts on bad procedure. (I'm not directing this at you, Dave, just following your point.) Plan the work better, or use a faster drying oil system (start with acrylics, use alkyds, water/oil emulsion, etc.) or don't use oils. There's no good excuse for doing things the wrong way, especially if you're supposed to know better.
actually painting oil on acrylic creates no bond whatsoever (however the acrylic wont repel the oil like oil repels the water in acrylic). So while it would be harder to peel off it is still possible. Painting oil on acrylic is the same as painting an a super smooth surface. Now if you add something like calcium carbonate (marbling dust) to the acrylic you create a porous surface. This will create a physical bond between the acrylic and oil much like the bond of oil with acrylic gesso.
Check out the link to see Dorman in action. Near the bottom is a minute or two long video. I can't tell how much is oil and how much is acrylic and markers but apparently he's been doing this technique for a while.
I use a glass palette too and once oil has semi-dried it still needs a fair bit of bodyweight and a sharp edge to shift. I also remember using a fairly polished metal plate as a palette thinking, "right, this will clean up easily", it doesn't..
I'm not saying it's "archival" (a relative term surely?) but I'd expect sensibly applied oil on glass, plastic or metal to still be here long after I'm not.
If it outlives me, I'm cool.
Last edited by Flake; August 14th, 2008 at 09:58 AM.