Typically, glazing is used in most all picture framing of art on paper, photographs and documents. Glazing protects the art from damage by finger prints, dirt, water and UV rays. The exception is paintings on canvas and board because oil and acrylic paint are quite durable to touch and even water. Protect from Fading UV filtering products are always recommended to prevent fading of artwork due to UV exposure. Never hang artwork in direct sunlight, even with UV filtering glass because there will be heat build-up and thermal cycling. UV rays are also present in a bright room with indirect sun and in fluorescent lighting. Protect from Breakage Acrylic is unbreakable and weighs less than glass, but is susceptible to scratching and thus requires extra care while cleaning. Because broken glass can damage artwork it is recommended to use acrylic if the artwork is very valuable, large, being shipped, or installed over a bed or couch where someone might be injured in an earthquake. The advantage of glass is that it will remain scratch-free forever. Protect from Glare Some lighting situations create glare on the glazing that distracts from the enjoyable viewing of artwork. Non-glare products reduce the glare with micro-etching of the glazing. The etching also reduces clarity to some degree. Museum Glass and Acrylic For the ultimate in picture frame glazing there are museum products that reduce glare with a special film that does not interfere with the clarity.