[poliss]

A cheap way of making paste for fixing backscenes is to mix plain flour with water until a smooth paste is formed. Unlike wallpaper paste this will not shrink the paper and is anti-mould chemical free. I learned this from hanging wallpaper on dollshouses I used to make.

 

[poliss]

Don't ask me about the science about the flour and water paste not shrinking the paper, it's just something that is known in the dollshouse making fraternity.
The anti-mould ingredients are poisinous, (or they used to be), and are not recommended for anything where kids might lick. So don't let your kids lick the walls.