Casein glue is a type of adhesive made from milk protein. The glue is known to be very strong over a long period of time and is resistant to water. It has a longer drying time (clamp your piece of work for 2 – 4 hours). There have been many uses for casein glue throughout history. There are records that show it was created and used by the ancient Egyptians. It was employed in the Middle Ages to bind together thin panels into thicker plates on which artists could paint. It also is believed to be used by makers of famous musical instruments that have lasted for a century or more. It was used extensively in woodworking, furniture making and even to assemble early wooden aircraft (WW2 fighter aircraft).

The process of creating this glue is nearly identical to that of making cheese and can easily be performed at home. There are various recipes to be found online. The most basic ones only contain: skimmed milk (powder), vinegar, baking soda and water. Replacing baking soda with slaked lime gives a more durable and water resistant glue.