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The substance that sticks tesserae to the backing. The choice of adhesive will depend on the type of materials used in the tesserae and the backing (for example if one or both are porous), and also whether the work has special requirements (for example, needs to be waterproof, frostproof or to set quickly). Common choices are PVA glue (white craft glue), ready-mixed tile adhesive or cement based adhesive, but other possibilities include silicone sealant (bathroom sealant) and epoxy glues.