Natural starches come in many different forms. Starches make an excellent water soluble adhesive-paste for bookbinding, hinging prints and repairing works of art on paper. The strength and physical properties of starch adhesives can be modified by their blending with PVA, PVOH and Methocel A4CP adhesives. If needed, pH levels can be adjusted by the addition (3-5% by weight) of precipitated calcium carbonate. Any modifications must be done after the starch is cooked.
COOKING OF STARCHES to form a paste can be done in either a microwave in a deep bowl or on a hot plate in a double boiler. Either way you choose, you must stir the mixture as often as possible or you will end up with lumpy paste. If you use the microwave, heat in short 20-30 second bursts, stir, heat, stir and so on for 4-5 minutes. Either way you will have to experiment with the proportions of starch to water, but a good starting point with any of the starches is 1 part starch to 4-5 parts of distilled water.
Yes Paste is an all-purpose adhesive, designed for high performance in a wide range of applications. Yes! Paste will not wrinkle or curl delicate or lightweight materials, due to its low water content. It is slow-setting, allowing for repositioning and adjust of materials. In addition, it is 100% acid free and has a 6.5 pH, making it perfect for archival use. It's used for bookbinding and many other areas of conservation. It is not recommended for use with photographic materials. Clean-up is a breeze with Yes! Paste; simply dilute excess glue with warm water. Composition: Water based corn dextrin, water and preservative. Physical properties: Transparent & permanently flexible when dry. Usage: Apply with a stiff brush