I'm looking for thin sheets of a material that I can use to cover a series of oil paintings stacked flat, which won't react to the paint itself and will prevent them from sticking or bonding to anything else.
I've got a collection of paintings that I'm in the process of sorting and preparing to archive. Much of the work was done in a heavy impasto style, so many of the paintings are still sticky if not actually wet. They're being reasonably well kept (dry, temp-controlled room) but I don't have the resources to box each one, nor to construct shelving that would keep each from contacting the next. There's a lot of them, and they're barely fitting into the (borrowed) room that I have them in now. As I've been pulling each one out to photograph & catalog, I'm finding that in some cases considerable damage has been done by the previous painting's backside sticking to the painted surface.
So I'm looking for sheets of material that I can place over the face of each one to keep them from sticking together. This article
recommends sheets of polystyrene, which it says is also known as 'jablo', but after searching online and calling around my local art supply & hardware stores I've turned up no results, or even anyone who knew what jablo was. They know what polystyrene is, but don't have anything suitable for my application.
Any MeFites have experience with this type of thing? I need sheets as big as 36" square, but could get by with 18 x 24". I don't even know if polystyrene is really appropriate, and would prefer to use something more eco anyway, but need something that will do the trick for at least a couple of years.
Thanks in advance!