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From a conservation point of view, would it be a problem to layer acrylics, gouache, watercolors, inks, etc. over each other? For example, would a layer sandwich of:
(or some other combination) be a problem? I'd imagine that, once dry, the acrylic layers would keep everything below set.
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I don't think there would be serious problems with acrylic over light watercolor wash, but gouache applied over acrylic usually beads up and cracks as it dries. The typical result of painting acrylic over a soluble layer like gouache is a crazed paint film, probably with weak attachment. The entire stack would likely remain water soluble due to the gouache component.
There is the difference between water-soluble paints
(watercolor, gouache, distemper, etc.) these are diluted with water and are
resoluble or at least potentially dissolvable, with later applications of
water. Then there are water-diluteable paints that dry to be water insoluble
(acrylic dispersion, vinyl dispersion, egg tempera, various oil in water
temperas, and to a lesser extent, casein.)
Understanding the qualities, solubility, and inherent
brittleness of these components can afford a plethora of effects.
In your scenario, the acrylic dispersion would likely
partially or completely dissolve or incorporate the watercolor into its layer. This may or may not be desirable depending on
your aesthetic aims. One could apply a spray acrylic varnish or size to prevent
the superimposed acrylic dispersion paints from disturbing the watercolor.
I would worry about the adhesion of gouache to an acrylic
dispersion layer of any thickness or gloss. Additionally, gouache is a rather
brittle medium. In general, it is best to keep ridged and brittle layer at the bottom
of the stratigraphy. Again, the gouache would be dissolved by the subsequent acrylic
dispersion paint unless the gouache was fixed in some manner, preferably with an
acrylic solution fixative or varnish.
Finally, just as a word of caution, it is generally best to
avoid complex mixtures and layering of disparate paints unless that is necessary
for your final effect. The chance for failure increases with increasingly complex