This is why it's a good idea to use a fast drying medium for underpaintings if you're doing one, such as Gamblin's galkyd gel. Or, if you're using different mediums, such as liquin and linseed oil, go from the fastest drying to the slowest drying in this case it would be liquin, then linseed oil. For example, if you're painting with linseed oil, use less linseed oil in the paints of earlier layers, and add a little more for each consecutive layer. Just in case you haven't heard this very important note already when painting with mediums, always paint with your faster drying mediums first (or less of your slow drying medium), and transition to more fatty, slow drying mediums to avoid the paint cracking. Once I found my feet, however, I was flying, and once you learn about the basic techniques, you will be too! When I started out I had no idea what I was doing, and was fairly aimless in my approach to painting. However, most artists will only divulge their "primary" medium - "Oils on Canvas" rather than list or explain all the materials used in their painting.Do you find all of the knowledge out there about oil painting a bit intimidating? It can be hard to know where to start, especially when there's so many different techniques and methods of painting. Most prepared canvases use acrylic gesso - and some oil painters do their under-painting or tone their canvas with acrylic colors (again, because it is fast drying, and oil paint adheres to dry acrylic paint). What really puts this whole thing in a twist is the fact that many oil paintings actually use BOTH acrylics and oils. As weird as it sounds, the easiest way to tell the difference is probably to smell the painting - as most oil paintings have the distinct smell of linseed oil that never goes away, while acrylics tend to have very little odor at all. How noticeable any of this is depends on the age of the painting, quality of materials and application. All paintings, and paint materials age - oil paintings tend to yellow more than acrylics because of the oils. Many, many things factor into how a painting ages, and the cracks you describe might (should) take years to develop in an oil painting and acrylics might develop cracks if the painting gets handed while it is too cold or after exposure to the elements. A more coarsely ground paint will look less shiny (more matte) while a very finely ground and dispersed pigment will appear more glossy in either oils or acrylics. "Shininess" - or Sheen of the paint is another factor of the quality of paints used, and how the paint is made and applied. The generality is more the opposite, simply because it is technically easier to achieve a very textured painting with acrylics than it is with oils. Texture also can be controlled with mediums in either oils or acrylics. and the transparency or opacity of both is more a factor of the amount of medium (oil or acrylic) is used in the process. Acrylics can layered and textured much more than oils because of their fast-drying property. probably more than which binder/medium is used. And the surface quality of the paint depends a great deal on the quality of paint used. Most painters will dispute the idea that acrylics have more vibrant color than oils - mostly because the amount of pigment tends to be higher in oils than acrylics (because acrylics generally need a lot more ingredients to function than oils). There are also preparations for canvas and linen that oil painters can use that aren't gesso, and leave the look and feel of an un-primed surface - but prevent that leeching I described. but acrylic painters are just as likely to use a primed (gesso) canvas as oil painters. Acrylic paintings won't develop an oil stain around color. Primed canvas is certainly recommended for oil paints, but artists will paint with oils on un-prepared canvas or linen - generally you'll see a halo of oil that leeches into the fabric on oil paintings a few days after painting. (I work for a company that makes paint for artists - both oils and acrylics). Sorry, I have to challenge what you're saying a little bit.
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