Acrylic Paint

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. more...

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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.

History

Acrylics were first made commercially available in the 1950s. These were mineral spirit-based paints called Magna offered by Bocour Artist Colors. Water-based acrylic paints were subsequently sold as "latex" house paints, although acrylic dispersion uses no latex derived from a rubber tree. Interior "latex" house paints tend to be a combination of binder (sometimes acrylic, vinyl, pva and others), filler, pigment and water. Exterior "latex" house paints may also be a "co-polymer" blend, but the very best exterior water-based paints are 100% acrylic. Soon after the water-based acrylic binders were introduced as house paints, artists (the first of whom were Mexican muralists) and companies alike began to explore the potential of the new binders. Water soluble artist quality acrylic paints became commercially available in the early 1960s, offered by Liquitex.

Techniques

Acrylic artist paints may be thinned with water and used as washes in the manner of watercolor paints, but the washes are not re-hydratable once dry. For this reason, acrylics do not lend themselves to color lifting techniques as do gum arabic based watercolor paints.

Acrylic paints can be used in high gloss or matte finishes. As with oils, pigment amounts and particle size can alter the paint sheen. Likewise, matting agents can be added to dull the finish. Topcoats or varnishes may also be applied to alter sheen.

When dry, acrylic paint is generally non-removable. Water or mild solvents do not re-solubilize it, although isopropyl alcohol can lift some fresh paint films off. Toluene and acetone can remove paint films, but they do not lift paint stains very well and are not selective. The use of a solvent to remove paint will result in removal of all of the paint layers, acrylic gesso, etc.

Only a proper, artist-grade acrylic gesso should be used to prime canvas in preparation for painting with acrylic. It is important to avoid adding non-stable or non-archival elements to the gesso upon application. Acrylic will not form a stable paint film if it has been thinned with more than 30% water content. However, the viscosity of acrylic can successfully be reduced by using suitable extenders that maintain the integrity of the paint film. There are retarders to prolong drying and workability time and a flow release to increase color blending ability.

Read more at Wikipedia.org