Pinholes

Pinholes: Small pits the size of a needle head or leather-like pores appear from the surface downward.

Description:

Pinholes are mainly caused by solvent or moisture trapped under the surface layer without a chance to evaporate.

Cause:

1. Excessively thick paint layers and insufficient drying time.
2. Air trapped in filler, forming pinholes after sanding.
3. Incorrect choice of thinner, such as wrong mixing ratio, poor quality, or unsuitable drying time.
4. Improper cleaning or preparation of the substrate, leading to retained moisture and pinholes during evaporation.
5. Incorrect spraying technique, such as improper spray gun settings or spraying too close to the surface.
6. Insufficient drying, sudden heating, or overly rapid external drying.
7. Excessively high temperature of the substrate during application.

Repair:

1. Sand down to the filler, fill the pinholes, and repeat the necessary filling work. Sand the surface smooth and repaint.
2. Use a scraper vertically against the surface and apply the primer very thinly to ensure the pinholes are covered. Also ensure the scraper does not lift the primer during the motion.

Recommended products to prevent and correct potential issues:

• Abrasives and accessories

• Paint spray guns
   

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