Normally no oil painting gets framed under glass, but yes, it can be done. However this type of picture frame is not constructed very often and for a few good reasons. Firstly, the glass should not rest or touch even an "old", or aged, oil painting because the white oxides in the paint may take up to several months to thoroughly dry. Often, an oil painting may feel hard to the touch and yet the inside layers are still soft and curing, or drying. The painting media (plural, as there may be several, coats or paint layers of different paints) and the method applied by the artist will affect the longevity of an oil painting. ...