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Step 3Adding Things
Wheatpaste will work completely fine with just flour and water, some say you can achieve better properties in the glue by adding things, but others argue against adding anything to it, therefore I cannot confirm or disprove the flowing, it is simply all the comments from wheatpaste recipes online rolled together:
Salt: one spoonful or more of salt per 1/4 gallon will increase the shelf life of unused glue, and dismiss any chance of the glue rotting while drying. People also use it in freezing temperatures to lower their glues freezing point, but some say it but increases dry time exponentially, especially in the cold. Add anytime as long as it dissolves.
Sugar: two spoonfuls or more of sugar per 1/4 gallon will make the glue "stickier" when wet, and could increase dry strength due to the crystalline structure of glucose, but most say it is completely unnecessary. I think it slightly caramelizes to help thicken the mixture. Add near end of heating to prevent carmalization.
Cinnamon/Peppermint extract: 5 drops per 1/4 gallon will make the unused glue rot slower, allowing it to keep for several weeks. Add any time.
Alum: one spoonful per 1/4 gallon will also make the glue rot slower, allowing it to keep for several weeks. Possibly a thickening agent as well. Add near end of heating.
Vinegar: one spoonful per 1/4 gallon is also known to make the glue rot slower, allowing it to keep for several weeks. Also known to increase the durability of the dry wheatpaste. Add near end of heating.
Borax: two spoonfuls per 1/4 gallon may help reduce the smell while the wheatpaste is wet. May also change consistency for the better. Add near end of heating.
Glue: Adding glue or a powdered glue such as wallpaper paste MAY strengthen the glue, but also add to the cost. Wallpaper paste is sometimes know to be weaker than wheatpaste. Don't add too much or the glue will be too thick and wont soak into pores. Add near end of heating.
Sawdust: Sawdust added to almost any glue will increase it's gap-filling ability. Could be used to make molds. I made a cardboard sawdust putty with wheatpaste in my Cardboard Lumber instructable. Add any time.
Salt: one spoonful or more of salt per 1/4 gallon will increase the shelf life of unused glue, and dismiss any chance of the glue rotting while drying. People also use it in freezing temperatures to lower their glues freezing point, but some say it but increases dry time exponentially, especially in the cold. Add anytime as long as it dissolves.
Sugar: two spoonfuls or more of sugar per 1/4 gallon will make the glue "stickier" when wet, and could increase dry strength due to the crystalline structure of glucose, but most say it is completely unnecessary. I think it slightly caramelizes to help thicken the mixture. Add near end of heating to prevent carmalization.
Cinnamon/Peppermint extract: 5 drops per 1/4 gallon will make the unused glue rot slower, allowing it to keep for several weeks. Add any time.
Alum: one spoonful per 1/4 gallon will also make the glue rot slower, allowing it to keep for several weeks. Possibly a thickening agent as well. Add near end of heating.
Vinegar: one spoonful per 1/4 gallon is also known to make the glue rot slower, allowing it to keep for several weeks. Also known to increase the durability of the dry wheatpaste. Add near end of heating.
Borax: two spoonfuls per 1/4 gallon may help reduce the smell while the wheatpaste is wet. May also change consistency for the better. Add near end of heating.
Glue: Adding glue or a powdered glue such as wallpaper paste MAY strengthen the glue, but also add to the cost. Wallpaper paste is sometimes know to be weaker than wheatpaste. Don't add too much or the glue will be too thick and wont soak into pores. Add near end of heating.
Sawdust: Sawdust added to almost any glue will increase it's gap-filling ability. Could be used to make molds. I made a cardboard sawdust putty with wheatpaste in my Cardboard Lumber instructable. Add any time.
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If you want to keep this mix very long without rotten, just ad a spoon of acetic acid (vinegar) and will prevent from bad smeling.
we use this mix to fix political adds during pool campaigns...and we have campaigns almost always!!!!