Oil painting on canvas has been around for centuries. It is a style where images are sketched directly on the canvas and then painted over with oil-based colors. These are usually painted with linseed oil as their base, but safflower oil is another common type of oil that is instead included. The following aspects focus on painting with oil-based paintings.
Priming the Canvas:
Once the fabric is stretched, it must be primed before color paints can be applied to it. This is a reliably easy process and requires the purchase of acrylic gesso. If a pre-stretched cloth was purchased, it can already be processed. It is a good idea to check when you buy the canvas. There is nothing because you spend time on this step if it is not necessary. Be sure to shake the container well before applying it to the canvas. A coat will leave much more fun looks than several layers. Gesso will dry quickly. Make sure the first coat is dry before adding another.
Fat over lean
This term reflects the amount of oil presented in each layer of paint. It is important to keep track of this concept, to eliminate cracking of the paint when it dries. Some oil paintings take a few days to dry while others take a couple of weeks. This varying time is also dependent on the oil level in the color. Lean oil paint has less oil and dries faster than oily oil painting. Then the term Lean Over Fat is used to remind the artist to apply color with more oil over one with less. The more layers there are on the painting, the more oil should be present in each additional layer.
Solvents and resins:
Solvents are added to the paint to dissolve the resin when they are cleaned and they are also added to change the way the oil paints work. These solvents will evaporate over time and are highly flammable. Common solvents include; turpentine, mineral spirits, citrus-based thinner and alkyd-based media. Turpentine is the most common solvent used and it has a rapid evaporation rate. Mineral spirits have an average evaporation rate and are not as easily absorbed through the skin. These can also be purchased in odorless form.
While citrus-based thinners do not have the same offensive on an odor as the two previous forms of solvent, they still produce harmful fumes. There are citrus-based thinners that are made from food-grade citrus oil. Some of these are also combined with a solvent that is flammable and non-toxic, which is much better for the person using it. The alkyd-based media are good for speeding up the drying time for most oil-based colors.
Different oils enable varying drying times in oil-based paints, as well as providing a coating effect on the colors. Flaxseed oil comes from the flax plant, dries carefully and can be used with any color. Stand oil takes longer to dry than linseed oil, but it gives a surface that is even and looks like enamel. Poppy seed oil is very bucket and is often used with bright colors and whites, due to the less yellowing that occurs when it dries. It takes between 5 and 7 days to dry, which is longer than required for linseed oil.
Safflower oil has similar properties to poppy oil, but it dries faster. Walnut oil is very thin and is often used to make colors more fluid for use. Each artist has a preference for the type of oils used when oil painting on canvas .