Painting with Acrylics

Gone are the days when acrylics were what artists allergic to the solvents in oil painting used. Acrylics have their own advantages, characteristics, and unique possibilities.

Acrylic paint is fast-drying paint containing pigment suspended in an acrylic polymer emulsion. Acrylic paints can be diluted with water, but become water-resistant when dry. Depending on how much the paint is diluted (with water) or modified with acrylic gels, mediums, or pastes, the finished acrylic painting can resemble a watercolor or an oil painting, or have its own unique characteristics not attainable with the other media.

Acrylics are water-based paints, which means they can be mixed with water to thin them down and you clean your brushes with water. They’re made from pigment mixed with acrylic resin and emulsion. Acrylics are very fast drying and can be use in thin, watery glazes or impasto (Impasto is a way of applying paint, specifically a thick, textured application of paint where the marks made by the brush or painting knife stay visible. Impasto is evident in the work of artists such as Vincent van Gogh).

Differences between acrylic and oil paint

The main difference between acrylics and oil paints is the inherent drying time. Oils allow for more time to blend colors and apply even glazes over underpaintings. This slow drying aspect of oil can be seen as an advantage for certain techniques, but in other regards it impedes the artist trying to work quickly. The fast evaporation of water from the acrylic paint film can be slowed with the use of acrylic retarders. Retarders are generally glycol or glycerin-based additives. In the case of acrylic paints, the addition of a retarder slows the evaporation rate of the water, and allows for more water to be added and the paint workable, until the retarder has left the film and the paint layer is dry.

Oil paints tend to require the addition of a toxic solvent, such as mineral spirits or turpentine to thin the paints and clean up tools, though relatively recently water soluble oil paints have been developed for artist use. Secondly, oil paint films become increasing yellow and brittle, and will lose their flexibility in a few decades. Thirdly, the rules of "fat over lean" must be employed to ensure the paint films are durable.

Oil paint is able to absorb more pigment than acrylic because linseed oil has a smaller molecule than does acrylic. Oil has a different refractive index than do acrylic dispersions. This changes how light interacts with the paint films.

Due to acrylic's more flexible nature and more consistent drying time between colors, the painter does not have to follow the "fat over lean" rule of oil painting, where more medium must be applied to each layer to avoid cracking. While canvas needs to be properly primed and gessoed before painting with oil, acrylic can be safely applied to raw canvas. The rapid drying of the paint tends to discourage the blending of color and use of wet-in-wet technique unique to oil painting. While acrylic retarders can slow drying time to several hours, it remains a relatively fast-drying medium, and the addition of too much acrylic retarder can prevent the paint from ever drying properly.

Although the permanency of acrylics is sometimes debated by conservators, they appear more stable than oil paints. Whereas oil paints normally turn yellow as they age/dry(oxidize)—and require a removable protective layer of varnish—acrylic paints, at least in the 50 years since their invention, have not yellowed, cracked, or altered.

Another difference between oil and acrylic paints is the versatility offered by acrylic paints - acrylic is very useful in mixed media, allowing use of pastel (oil & chalk), charcoal, pen, etc. on top of the dried acrylic painted surface. Mixing other bodies into the acrylic is possible - sand, rice, even pasta may be incorporated in the artwork. Mixing artist or student quality acrylic paint with household acrylic emulsions is possible, allowing the use of pre-mixed tints straight from the tube or tin, so presenting the painter with a vast color range at his or her disposal.

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