Twist cap to open. Close cap tightly and store upright. School glue bonds most porous materials such as cloth and paper, and semi-porous materials such as pottery and wood. Use on clean dry surfaces. For porous materials: spread thinly, press and let dry. For semi-porous materials: spread thickly, clamp or weight, let dry 35 minutes or overnight for full strength. Keep from freezing. Not for photos, bare metal, underwater or healed surfaces. Clean Up: Playskool school glue is washable from skin and most children's clothing. For best results, soak clothing in cold water for 10 minutes, then launder according to garment maker's instructions. Do not dry clean. Glue cleans easily from hard surfaces. Use a damp cloth before glue dries. If dried, wash with soap and water.