Hi Allan!
I love how artist are so resourceful.... I bet your wife must love these Pyrex dishes in her fridge!

I am interested to hear for how long you have been able to keep the paints submerged, without noticing a change in their consistency.
I just tubed a bunch of paint and put left over paint in those small jelly jars that they give you when you order room service at hotels. I then placed them in a jar vacuum and sucked the air out. I use the vacuum daily in the kitchen to suck the air out of opened containers and have to say that the food stays fresh much longer. That led me to try it with the paint.