This is the lightweight, and dirt cheap method I use for traveling with wet oil paintings on panel. I find the specifically designed wet-painting carriers add too much weight, especially if you have 20 or more freshly painted panels to pack, plus no one in Europe makes them for panels cut in centimeters. Like my cigar-box, it’s not my idea, and I can’t remember where I learned it.
You’ll need a wine cork, a knife or x-acto blade, masking or sellotape, and two or more panels of the same size. (Sometimes finding a wine cork isn’t as easy as it sounds. In Myanmar for example it took us forever to find decent wine, luckily there is a German producing some great stuff in the hills north of Inle lake).
First, I cut the cork into slices about the width of a toothpick, then cut those into halves (if I don’t have a lot of cork, slicing into quarters will work too). I put those into the corners of one wet panel, then put a second panel on top, with the two wet paintings facing each other. If the panels are flexible or I’m worried they’ll get pushed together, I’ll put another small piece of cork in the middle of the paintings – trying to make sure it wont ruin something important. Cork works great as it’s soft enough to not damage the board, but hard enough to keep the panels separate. Metal objects (coins or metal washers) can leave an indent in the panel.
I then tape the corners of the panels together as tightly as possible so the cork doesn’t slide around. If I have an odd number of boards, three can be taped together as the last group.
Obviously for this system I need multiple boards of the same size. I also have to repaint the corners after the cork is removed, but there shouldn’t be anything important painted in the corners anyways.
At any rate it’s a cheap and easy way to move around with wet paintings without adding weight to your set-up.