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Final varnish
Is it absolutely necessary to varnish a painting once it is finished? What happens to an oil painting if it isn't varnished? I have some oil paintings on canvas that are several years old and have never been varnished. Do I need to clean the paintings before I varnish them? I live in Portland, Oregon where it is very humid, will this effect a final varnish layer? Thank you for any information you may have!
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