Here’s something I “invented” for transporting my wet canvases. It’s cheap, easy, and generally won’t mar your wet paintings.
1. At the hardware store, get the plugs that you put on electric sockets to prevent children from putting their fingers into the sockets or drafts from entering a room. (The thinner the prongs, the better.)
2. Place 4 plugs between your canvases or panels. Wet side to wet side. (It’s best if the canvases are similar sizes. I’ve yet to try merging different size canvases).
3. Use masking tape to secure the plugs in position.
Repeat Steps 1-3 for multiple layers of plugs and canvases.