Gamvar, might fit the bill for some paintings.
Olifa, for example, will yellow over time and they say this will not. link and link.
I have been using Soluvar Varnish (an archival medium) on acrylic icons with perfect results. Same thing- it will not yellow and it is soluble. If that's the goal, this is the possibility.
Egg white preparation for egg tempera.
Liberon Pale French Polish over gold. Haven't tested over egg tempera.
Cold wax. A tile-like appearance. Needs to be polished.
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