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I've had bubble wrap stick and leave little bubble patterns on a painting I thought was dry.
I agree with the above suggestions that unless the painting is, say a year old and VERY dry, not to have anything touching the paint itself. You can use push pins on the corners and then put a piece of cardboard over the top of that, so the cardboard is held away from the painting. I've also made a "pochade box" out of foam core to keep "not quite dry" paintings away from anything else while being transported.
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