Small deep holes in the paint surface: observing accurately one can see the paint layer in which the hole originated (sealer or putty).

Penetration of the final coat from holes due to air trapped in the application.
- Incorrect application of the filler (sanding, sealing, etc.)
- Too fast drying (oven or IR lamps) of the filler applied in too thick layers.
- Inefficient filling technique and putty sanding (leaving hollows)

After the complete drying through of the film:
- Sand the paint or filler completely to remove the pinholes; apply a suitable sealer filler, sand accurately and re-apply the final coat.

- Follow the prescriptions of the data sheet, respect the thickness of the layer and allow the correct flash off and drying times.
- Apply the putty in subsequent thin layers to avoid trapping air in the mass.
- Always check the substrate before applying the top coat and, if necessary, operate as indicated above.