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How can blistering be awoided in paint film?

- Blistering is formation of blisters in the paint film by local loss of adhesion and lifting of the film often caused by moisture trapped under the paint film. These blisters will often settle back to a smooth film when atmospheric humidity reduces. Any weakness in the paint system will allow the moisture to condense and form a globule which becomes a blister.

PREVENTION AND RECTIFICATION:

To minimise the chances of blistering occurring, the following steps should be followed:
- In extreme wet/humid weather conditions, dry sand only.
- Ensure all compressors and air lines are kept free of moisture.
- Ensure job is perfectly dry prior to any painting.
- Ensure sufficient build of topcoat is applied.
- Do not expose fresh paintwork to poor outside weather conditions.
- Do not allow street exposure of undercoated vehicles for topcoating 'later'.

Blisters must be sanded back to either undercoat or metal (wherever the blistering started) and repainted.
Strip to clean metal and refinish again may be the only long term solution.

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