Paper and poster conservator, Allan Thenen, from St Paul, MN, shows how he linen backs posters-- without using Japanese Masa paper or using frames, that support his cotton backing. Watch as he washes a poster in a water and ammonia bath, and applies the wheat paste directly onto the washed, cotton material, which has been laid and supported on a piece of plexi. No frames with stretched canvas used.
Allen Thenen has been doing paper and map conservation for years. An interesting clip to watch.
https://www.youtube.com/v/8ns1xE3MUCY