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Paint Correction on a Car with a Replacement Bonnet
A replacement bonnet may have different paint thickness, texture and curing history from the original bodywork. Treat it as a separate correction area.
Updated · NANOLAB Knowledge
A replacement bonnet may have different paint thickness, texture and curing history from the original bodywork. Treat it as a separate correction area.
Assess the starting condition
Ask whether the bonnet was supplied painted, refinished locally or repaired after installation. Inspect both broad areas and edges for inconsistencies. Thickness readings can help map variation when the instrument suits the substrate, but do not reveal a universal safe clear-coat allowance.
A practical working method
- Record the bonnet’s provenance and any bodyshop instructions before correction.
- Inspect texture and colour independently from swirl marks; polishing cannot guarantee a colour match.
- Use a small, conservative test and compare the cleaned result with an untouched reference.
- Set the accepted correction level for the bonnet before repeating the process across it.
Common mistake
Using the original roof’s compound recipe because both panels are horizontal ignores the replacement history. Chasing texture differences with more passes can remove useful paint without matching the surrounding finish.
What a useful result looks like
A useful result improves correctable surface defects while preserving the replacement paint. Note any limitations at handover and confirm the protection schedule with the refinisher before applying a curing coating.