Apply the glue to the picture surface in small amounts and spread it by using your hand or a sponge. Allow the puzzle to dry for 3 hours and then all the pieces will be joined together. To get the optimal performance, prepare 1 pack of YAVULU Powdered Puzzle Glue with 1 cup of water(200ml) Add product to the cup of water slowly and mix the solution in the meantime. Wait for 5 minutes when the product reaches a gel-like consistency and mix once again before using. MEASURING:Each 6 gram of glue can fix a 1000-4000 pieces puzzle. The package content holds 6 grams of glue. No solvent & formaldehyde. Not suitable for children under 3 years. Contains small parts which may present a choking. Avoid contact with eyes. For external use only.