youd have to use a solvent such as turpentine, white spirits or other similar product.
Hello, When you start an oil painting, the paint isn't shiny at first. The canvas ground sucks in some of the oil, and lean oil paint isn't very shiny anyway. Most painters don't like this matte and...
No I don't think so. There are properties in the vegetable oil that don't work with oils.
Magilp or Megilp
Yes, but better not over an oil painting that's more than 10 years old. The new paint wold hold properly (it will peel off in time)