I've used this technique before to display both sides of a document. The document, in this case a complete copy of 'The Pink', a Coventry City fan newspaper celebrating a famous cup victory, is encapsulated in Mylar film before being mounted and glazed both sides and framed. The picture above shows the front of the paper which seemingly floats in the aperture showing all the unevenness of the paper edges.
Previously I've only done this with a single sheet of paper and with no problems, but this newspaper comprises about 20 pages and is heavy! After several weeks of hanging vertically - it slipped.
This picture shows the reverse of the paper and it is no longer sitting squarely in the aperture, the bottom edge is just resting on the mount.
I took this problem to the advanced framing course mentioned in my previous blog, and received some advice on how to prevent the slippage.
The solution was to cut a strip of Mylar greater than the width of the aperture and fold it lengthwise to make a groove that the bottom of the paper can sit in. The folded strip was fixed in place underneath the mount and is virtually invisible, while the paper sits nice and squarely in the aperture again.
Of course, the whole thing, frame, mount and Mylar had to be taken apart for the remedial work, but thanks to the reversible conservation techniques used, this was no problem and all the original mount and frame materials could be reused and put back together again and 'The Pink' came through its ordeal unscathed.