A acrylate terpolymer is provided comprising 1-30% of total terpolymer weight epoxy-functional acrylate monomer units, 1-98% of total terpolymer weight tackifier acrylate monomer units, and 1-98% of total terpolymer weight compatibilizing acrylate monomer units, wherein said compatibilizing acrylate monomer unit is a acrylic ester derived from an aromatic alcohol containing 6-14 carbon atoms. In one aspect, the apparatus is sealing apparatus for a downhole tool such as a bridge plug, packer, or frac-plug. The client device transmits the image and a client identifier to a central server, which identifies the item and combines the information about the item with customer billing and shipping information to automatically create and process an order for the item without any further intervention by the user. These arms 14 support an operating section 19.