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I really love a varnished painting! For me varnish improves the look of a painting a thousand percent. It brings up the color and sheen of the paint and adds beautiful depth and luminosity. On my acrylic paintings I seal the paintings with three isolation coats and then three coats of varnish. Painting on linen and then using a good final varnish gives my acrylic painitngs the look of an oil painting.
Of course not everyone likes the look of a varnished painting, some people prefer a matte finish instead. The impressionist painters actually squeezed their paints out on to brown paper so the oil would leech out. Many of them left explicit instructions that their paintings not be varnished, ever.
Fortunately, varnishes are available in gloss, satin and matte so your paintiong can be proctected from dirt, UV rays and other airborne contaminants.