How to solve the problem of protrusion when writing seal script?

Solution: 1 Use white latex. When pasting, two people flatten the paper, or use a roller. 2. Wet the painting with water and brush glue on both ends of the alignment plate. It will be flat when it is dry, and there will be no bulging. 3. No matter whether it is mounted or not, you can't paste the whole back of the calligraphy and painting, and you can only paste it about 1.5 cm wide on the edge of the back plate. Mounted calligraphy and painting should also be sprayed with water to relax it before pasting. It'll be flat when it's dry. If it's a big painting, you can't use a glass frame, it's too heavy, so you should cover it with film. Cover with heat shrinkable film. According to the above procedure, after drying, cover the heat shrinkable film until it is flat. Fold the four sides of the thermoplastic film behind the board and stick it with adhesive tape. When everything is finished, stand the board upright and lean on it. Use a big aluminum pot (boiling water) to pour boiling water from above, layer by layer, about a foot. If it is not flat enough, water it with boiling water, so it will always be flat. A six-foot-long heart-shaped picture, a big pot of boiling water is enough.