What are the causes of bubbles in electroplated varnish?

If the plating gloss is used for a long time or it is improperly maintained, bubbles and particles will appear. What is the reason? How do you need to prevent it?

First, the paint cannot be evenly applied. Because it cannot be evenly applied, air particles will enter the paint.

Second, the force of the finger pressure nozzle is not enough, resulting in the paint can not be evenly mixed when ejected.

Third, the paint is too thick, which can easily cause unevenness of the paint surface.

Fourth, the paint is contaminated due to external factors.

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