Acrylic-Based Pigments, ContinuedAcrylic paintpermanenceand opacityAcrylic paintgroundsSubstratesPainting inacrylic paintsArtist grade acrylic paint is permanent. You can thin acrylic paint with waterbut, overthinning causes the pigment to separate lessening its permanence.Once it is’ dry, you can clean the surface of an acrylic painting with mild soapand water. Wiping the surface of an acrylic painting with cleaners containingpetroleum or coal tar derivatives may soften or dissolve the paint.You do not require ground or surface preparation when painting in acrylic .paint because of the outstanding adhesive quality of the binder. There is anacrylic gesso available for painters who prefer to paint over a ground. Thisgesso is very smooth and may be used under oil paintings to provide afoundation with some elasticity. You will not be able to paint with acrylicpaint over an oil-based or oily foundation.Substrates or the surface on which you apply acrylic paints may be canvas,canvas board, masonite, wood panels, and metal. You may also applyacrylic paints to paper products and fiber cloth. No sizing or ground isrequired. When using an impasto, paint on a rigid backed, nonabsorbentsubstrate.Acrylic paints have the consistency of oil paint and the applicationcharacteristics of watercolor. Acrylics dry fast so you can build upsuccessive washes quickly. You may apply transparent or semitransparentglazes over solid values. Use a wet or dry brush blending technique to blendacrylics.Continued on next page1-54
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