We’ve finally begun making the storage jacket for our Diplodocus scapulocoracoid. Because this specimen is still in a half field jacket, and not in the sandbox, we have to modify our technique a bit. The permanent storage jacket needs a flange around the edge to give room for bolting the two halves of the jacket together. We usually make that flange by extending the plaster out over leveled sand in the sandbox. In this case, without sand, we made a flange out of cardboard (above), and will extend the plaster over that.
From that point forward, the process is pretty much the same as with any storage jacket. We cover the specimen with plastic wrap to keep the plaster off the bone, then cover that with sheets of foam that serve as padding: