Wheat Paste (Wheatpaste) for Decoupage
10 drops clove, cinnamon, or peppermint essential oil
Add water then flour to a small saucepan. Mix well with small whisk. Add clove oil. Heat on medium, whisking frequently, for about 5 minutes or until just under a boil and considerably thickened. Allow to cool slightly, but use while still warm.
According to below rule of thumb, only 1.56 drops are actually necessary for this quantity.
Essential oil preservative: 5 drops per 1/4 gallon will preserve glue, allowing it to keep for several weeks.
If you wheatpaste inside (like putting up wallpaper or homemade paper over windows) add some cayenne to the mix. The bugs eventually like to eat wheatpaste and the cayenne keeps them away.