I use an old cookie sheet as a palette, and I usually line it with freezer paper. It has a plastic side that works well. It curls up, though. In the past I’ve taped it down, but it occurred to me today that magnets might be a better solution. And they are!
(The magnets are from the bottom of a shower curtain liner. Piglet removes them, so I’ve got a stash.)
red paper boat 