This only slows the drying, however. It doesn't stop it. So after several days I can no longer use those paints. They start to develop a dry film that gets chunks and bits in your painting. So I have to toss them out.
I haven't yet found a good method for cleaning dried paint out of plastic containers so I was just throwing the whole container out once or twice a week and getting new containers. This wasn't working all that well, though. Besides the fact that I can't eat enough turkey sandwiches to keep myself supplied with containers, the "green" side doesn't like the idea of throwing so many of these away. Because the plastic has been contaminated by paint I can no longer put the in the recycle bin. I don't like the idea of throwing so many plastic containers in the land fills so I wanted to think of a better, less wasteful, solution.
I know many artists line their palettes with paper so I decided to line my plastic container with paper. I didn't have any "proper" paper for such a thing so I looked around for what I had on hand. All I had on hand that I thought might work was parchment paper, normally used for baking. I cut a piece and put it in.