Paper Mache Recipe 1 part flour to 5 parts water. Start out by putting 4 parts water into a pot, boil, mix 1 part flour to 1 part water. 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 glue in small amounts until you get the desired consistency. If you live in an area with high humidity, add a few tablespoons of salt to help prevent mold.