Automobile bumpers are usually repairable, and the specific method depends on the type and extent of the damage. For minor scratches, sandpaper with a grit of 2000 or higher can be used with a polisher for sanding before touch-up painting, ensuring the paint finish matches the original factory gloss. If there is a dent with a diameter of less than 5 cm and the paint surface is not cracked, hot water above 80°C can be used to soften the plastic, followed by resetting with a suction cup; during operation, local stress concentration should be avoided. For crack repair, a special welding rod for PP material is required, with the welding temperature controlled between 350-400°C, and the weld seam must be sanded smooth. In the case of complete fracture, a composite solution combining bolt reinforcement and plastic welding is recommended: a 6mm diameter plastic bolt is installed on the inner side with a special adhesive, and the clamping force should be maintained for more than 12 hours after curing. The repair must be carried out in an environment with a temperature of 15-25°C and humidity below 60%, and rain or car washing should be avoided within 24 hours after repair. If the damaged area exceeds 30% of the whole, or the repair cost is close to 70% of the price of a new part, It is best to replace it directly to ensure safety. The cost of replacing original factory parts is usually between 800-3000 ringgit, depending on the car model and part grade.
