To make this paper mache paste, you need 1 part flour to about 5 parts water. Start out by putting 4 parts water into a pot on the stove and bring it to a boil. While you are waiting for it to boil, mix 1 part flour to 1 part warm water. Beat this mixture briskly to remove lumps.
Once your pot of water is boiling, slowly stir in the water and flour mixture. Mix well and let it boil for 2 - 3 minutes. It should be smooth and have the constancy of thick glue. If necessary, you can add more water or flour in small amounts until you get the desired consistency. If you live in a humid climate, you can add a tablespoon or two of salt to your paste mixture. The salt helps prevent mold.
Make sure you store this glue in the refrigerator if it will take you more than 1 day to finish your project.