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Chair Doctor glue can penetrate narrow cracks in chairs. If a chair has a loose rung, an injection of Chair Doctor Glue will first swell the rung & then bond it. The low viscosity lets it soak into the end grain of wood, swell it & then freeze the wood in its swollen state as it cures. A film of dry glue is left on the walls of the wood cells, preventing contraction. Cleans with just water. Chair Doctor Pro includes 4fl oz of glue, 1 syringe, 3 sizes of blunt-tip needles & 2 fl oz bottle has integral needle.