I use shellac.

My free-of-charge sciencey opinion. Worth every penny paid for it.

From reading, applications of paint take longer to dry and are more likely to get SID. This could be heavy applications or in places where it gets really humid.

I wouldn’t use GAC because it’s basically acrylic and is therefore somewhat susceptible to the problem. The acrylic film remains permeable because it doesn’t really polymerize like an oil film. The acrylic binder is already polymerized and suspended (not dissolved) in the water. As the water evaporates, the teensy little acrylic particles do link together, but there are teensy gaps big enough to pass water molecules.

That’s why acrylic is water resistant, as opposed to water proof.

Shellac is a solution of bug exoskeletons dissolved in alcohol. As the solvent evaporates a more impermeable film forms. Oil based primer sealers (OK for latex so assumed by me to be OK for gesso) form an even more impermiable layer as the oil polymerizes with exposure to oxygen.

There is the time and mess factor for sure.