What should I do if the paint on the rear bumper of the car is scratched off?
Methods for dealing with chipped rear bumper paint
When the rear bumper paint is accidentally chipped off, there is no need to worry too much. You can adopt the following several methods for handling it:
Simple treatment: If the chipping is not severe and the scratches are relatively shallow, you can repair it yourself by purchasing a paint patching pen. However, note that this method is suitable for minor scratches. For deeper or large-scale chipping, it is recommended to seek professional repair services.
Apply original factory paint: Go to a 4S store or professional repair center, ask the technician for the original factory paint, and then apply it yourself to the chipped area. This will restore the vehicle to its original appearance, but you need to have certain skills and experience when applying it. If you are unsure, it is recommended to seek assistance from a professional.
Apply stickers: Choose a suitable sticker and stick it on the chipped area. This can cover the defect and add a personalized and beautiful touch to the vehicle. This method is simple and easy to do, but you need to select stickers that match the vehicle to ensure overall aesthetics.
When dealing with the chipping of the rear bumper, the key is to choose the appropriate treatment method based on the degree of chipping. For minor scratches, you can use a paint patching pen for repair. For deeper or large-scale chipping, it is recommended to seek professional help. No matter which method you choose, you need to use high-quality materials to ensure the treatment effect and overall vehicle aesthetics.
Cracks in the rear bumper need to be determined whether they are only paint surface cracks or plastic substrate cracks. For the former, polishing or paint patching can be done; for the latter, back plastic welding + front sanding and putty application + painting is required. Simply patching the paint will cause it to crack again.
Quick self-check and solutions
Only fine lines (cannot be scraped off with a fingernail and have no light transmission) belong to paint layer aging or minor stress cracks. They can be polished or partially patched with paint.
Visible cracks / transparent / fingernail can be stuck in: The plastic substrate has cracked. Back plastic welding + front sanding and putty application + painting is required. Simply patching the paint will cause it to crack again.
Crack length > 10cm, accompanied by deformation or snap ring fracture: It is recommended to directly replace the bumper. Repairing it may not guarantee the collision buffering performance.
Repair plan selection
Minor paint cracks: Dip a fine sandpaper (above 1500 mesh) in water and gently rub it → polish with a polishing agent; if still visible, apply the same color paint patching pen or local spray paint.
Small cracks in the substrate (< 5cm and no deformation) → Remove the bumper → Clean and sand the crack → Back plastic welding gun melting and welding wire (for more stable reinforcement) → Front sanding and putty application → Sanding → Painting.
Severe cracking / deformation → Do not repair, directly replace the new bumper (can go through insurance claims), to avoid falling off or losing the energy absorption function during driving.
Notes for Attention
Plastic parts should not be welded or glued with metal or strong adhesives. Instead, they must be connected by using special plastic welding rods through heat melting.
Self-repairing paint can cause color differences. To achieve a better appearance, it is recommended to have it done by a professional shop with color matching and spraying.
If the cracks are caused by impact, first check if the internal anti-collision beams and brackets are damaged. If necessary, handle them together.
If you are unsure about the depth of the cracks, you can gently scrape the cracks with your fingernail in a horizontal direction. If it feels smooth and is just a paint pattern, follow Scheme 1. If there is a distinct step-like feeling or light transmission, follow Scheme 2 or 3.
Whether the bumper damage affects the annual inspection depends on the extent of the damage. Minor scratches usually pass, but cracks, deformations, and missing parts usually cannot pass the annual inspection.
What can pass
Minor scratches and small dents: Do not affect the overall flatness and appearance coordination. Most regions can pass normally.
Small cracks: Do not cause obvious flaws and do not affect the structural integrity. Some inspection stations allow passing.
What cannot pass
Large cracks, fractures: Obvious deformation, missing parts, loose and detached components.
Bumper plastic plate damage: Considered as incomplete appearance parts.
Damage causing a significant difference in appearance from the registration status: Violates the requirement of "complete, intact, and firmly connected" components.
What is the most reliable solution
Check the degree of the cracks in advance and compare with the appearance photos of the vehicle registration certificate.
For severe damage, it is recommended to repair or replace first before inspection.
There are differences in the enforcement standards across regions. You can consult the local inspection station in advance to confirm the standards.
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