I’ve been using Soluvar, a matte oil-based removable varnish on my work and I’ve been very happy with the results. Except – except for the fumes…
The stuff is nasty to breath around. The VOC’s are intense and it requires both tolerance from the people around it and a very large fan (Patton Air Circulators rule).
I’m trying a Windsor-Newton Acrylic Matte varnish, to see if that will get me enough protection for an acrylic painting, and leave in the color saturation and crispness I was getting from the solvent based products. This would NOT work for oils, but oils are also less permeable and susceptible to dust becoming immersed in the paint over time.
I’ve been using a Golden Acrylics data sheet to determine how to protect acrylic paintings over long periods of time. I use a half matte acrylic medium and half water solution in two coatsd to isolate the paint – to put a colorless barrier between conservation materials (varnish, wax, etc.) and the painting itself. On top of that I apply varnish – if the Windsor-Newton product can seal, stay clear and isolate the acrylic from incorporating dirt, and on top of that not smell so goddawful, that would be wonderful. We’ll see.