Thought someone might find this useful. A glass pallet that can be used for oil paint that fits into the wet pallet and case they make . https://www.redgrassgames.com/ they say it can keep oil paint workable for at least three days depending on conditions. Scroll down for info on the glass pallet .

Glass palettes have been about for years. Nothing new really. Redgrass haven't invented the wheel with anything they've released so far really.

Have heard about oil paints being put in the freezer and being usable for way longer than 3 days.

White ceramic tile in a plastic lidded take away container.
Into freezer lasts for at least 3 weeks, duration of holiday so maybe even longer.