Hi Marcus!
That layer is a hard acrylic board. I always use a thin acrylic board inside protecting the front of my paintings, to avoid particles of UPS (which I also use to protect the work, like many companies do when they ship their products) from sticking to the wet (or semi-wet) paint in the moment of the "unpacking process". You have to think in advance. When your client unpacks it, he will not know technically how to procede, so it's up to you to make it simple and safe for him. Small particles of UPS are really a pain, and sticky paint seems to atract it like sugar to flies. In the first picture of that packing in a previous post you see 2 pieces of wood attached to the painting (stretched canvas, unframed). Since it was shipped unframed, I did not have to worry about it's sides, so I used 6 small screws (3 each side) to fix the 2 pieces of wood in the longer sides of the canvas. That way I constructed a kind of "cassis" to support the surrounding protection. This structure was only to create an empty space between the wet surface and the materials used for packing. I used thick pieces of UPS (5cm) all around. Knowing about the danger of the small particles, I covered all the UPS pieces with a thin plastic (wrap). The front was protected with the acrylic board, between the UPS and the surface of the canvas (plus the "empty space", of course). I found that it doesn't matter how much you roll the UPS with the wrap plastic, the clients always destroy them when unpacking, so the acrylic board was the best solution to minimize the problem. You can stick a warning somewhere inside the pack, saying "at this point you must keep this side up and cut all the tapes, remove all the UPS and pull the picture UP. Keep it's face down untill you move it away from the remainings of the packing" ( see the picture attached bellow). Well this is for when I ship unframed works. Framed ones require an extra protection and I'll send some pictures showing you how I packed this painting of this topic in a new post.
Ant
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