When I have decopauged or painted on plates, etc., I use a spray sealer or even Mod Podge, BUT you can't wash them. I find that the "work" will still come off even if you seal it. I do the images from the back so the plate can be used. Ify ou do the work on the front, you do have to put something down on the plate (I think at least) if you are going to be putting food on that sealed part of the plate.
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