If it has old paper tape residue, remove loose areas of the tape with moisture if it is possible. B. Cover the rabbet with buffered board if necessary to fill gaps. C. Clean the glazing material and let it dry thoroughly. D. Make a sandwich of the frame contents with the acid-free corrugated backboard on the bottom, topped by a moisture barrier of polyester film, the matted item and the glazing material. However, if the item is on thin paper of has friable of flaking media, it must be glazed with glass, owing to the static electricity inherent in the plexiglas.
Sprays purported to reduce static have only a temporary effect.
Plexi and glass require different cleaning solutions and different packing techniques, so it is wise to label the back of the frame to indicate which glazing material is used. Back the exposed part of this tape with a second piece the same length. Lay a third piece over this to provide an adhesive edge to wrap around the back of the corrugated board or polyester film moisture barrier. F. Insert the sealed package into the frame, face down. H. Dust seal the back of the frame over the back board with an approved tape.