Just stumbled on something new to me.
These Gamblin products present another option to replace oiling out or final varnish.
The main benefit is quick drying and solvent free. Either product can be tinted to apply as a glaze.
The downside is the product is pemanent and cannot be removed.
I’ve not seen these products in my art supply shops yet but I’ll keep looking. Probably an on-line purchase.https://www.gamblincolors.com/oil-painting/mediums/solvent-free-painting-mediums/