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Acrylics are very easy to use and seem to have been standing up well so far. They do not tend to yellow as far as anybody knows.
Acrylics have only been around for a few years compared to other media like tempura or oils so it is hard to say what they will be like after a few centuries.
The best varnish would likely be an acrylic varnish.
The one drawback to acrylics is that they are more susceptible to water damage than oils.
The one big advantage is that they dry so quickly
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