Warm this liquid mixture over low heat for 5 to 10 minutes, stirring constantly.
The paste will thicken considerably.
Gradually add another liter of warm water, letting the mixture heat up and thicken again after each addition of water.
Cover if necessary. Whisk regularly.
When the mixture forms thick drops on the whisk, which drip off slowly, the paste is ready.
Pour it into a spare container, such as an old pail or salad bowl.
When you hang wallpaper with this flour and water paste, you need to coat the wall with paste, as well as the paper.

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