The repair method of enamel bathtub paint shedding is as follows: 1. Clean the bathtub surface: clean the bathtub surface with warm water and soap to remove all dirt and grease. 2. Sandpaper grinding: Use 200-300 sandpaper to grind the bathtub surface to remove all loose paint layers and uneven surfaces. 3. Fill the depression: Fill the depression on the bathtub surface with filler to make it smooth. 4. Polishing filler: Use 400-600 sandpaper to polish the filler to make it flush with the bathtub surface. 5. Clean the bathtub surface: Clean the bathtub surface again with warm water and soap to remove all dust and debris. 6. Priming: Apply enamel primer on the bathtub surface and dry it. 7. Paint finish: Paint enamel finish on the bathtub surface and dry it. 8. Let it dry: Before using the bathtub, let the paint on the bathtub surface dry for at least 24 hours. Note: 1. Use enamel primer and topcoat to ensure that the repaired bathtub surface is the same as the original surface in color and texture. 2. When repairing the bathtub, make sure that the room is well ventilated to avoid inhaling harmful gases. 3. When applying primer and topcoat, use appropriate protective measures, such as gloves and masks, to avoid skin contact and inhalation of harmful gases.