How does an Artist use oil paints on an acrylic sheet?

A lot of art sites list a painting as Oil On Acrylic. Can anyone please explain the procedures used for such paintings. The logictics of how the various layers are painted onto the acrylic surface, etc.How does an Artist use oil paints on an acrylic sheet?
Practice makes Perfect.How does an Artist use oil paints on an acrylic sheet?
Not sure what ';they'; mean. But it used to mean that you paint an oil painting over a surface prepared with acrylic gesso (as opposed to a lead-priming). It could also mean that they painted the sketch and underpainting in acrylic paints, which dry quickly, then, put on the glazes with oil paint, which have a tendancy to dry slowly.


If you make a painting only in oil paints, you have to wait for the layer you just painted to dry or nearly dry before you paint the next layer. The reason for this is because in order for the oil, in the oil paint to ';dry'; it must combine with oxygen to polymerize (create molecular chains). Oil paint by itself doesn't dry by an evaporation of solvents, like a magic-marker, but through polymerization. if you paint another layer of oil paint over the layer that isn't ';dry'; yet, and If oxygen can't get to the layer beneath, eventually, the surface will get all knobbey. On other hand, if you paint a layer on top of another layer, and the top layer dries more quickly than the layer underneath, the top layer will crackle and crack as the bottom layer dries. Oil paint shrinks alittle as it dries.


So painters impatient to produce their work quickly sometimes paint the majority of their painting in acrylics which dry throug quickly without cracking. But acrylics tend to look chalky and flat, so, in order to get the richness of the color of oils, the painter uses oils to paint thin transparent layers of color-rich glazes over the acrylic. No shrinkage underneath. Durable, no cracking advantage.


This follows the old-master advice: Fat-over-lean. Each successive layer should have alittle more oil in it than the layer beneath.


Hope this was helpful.