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Workable Fixative over Underpainting?
I recently acquired a book by Frank Covino that endorses the use of a workable fixative sprayed over a "rub-out" method underpainting after it is dry to the touch. Thin glazes of color are then applied. My question is: Does the fixative adulterate the layers of painting and would the layers of glaze have to be "fatter" than the linseed oil/paint used for the underpainting? What happens to the fixative when it comes in contact with more layers of glaze? I have a wonderful underpainting and I would hate to ruin it.
I hope this question makes sense.
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