How do I spray coat my conformal coating?

For correctly spraying a conformal coating on to a printed circuit board there are two key factors to consider.

They are:

  1. What equipment do you need to apply the conformal coating?
  2. What technique do you use to spray the conformal coating?

Read further to find out more.


What equipment do you need to apply the conformal coating?

For conformal coating spraying a typical set up are:

  • Spray gun
  • Air Compressor for the Air Supply
  • Spray booth

This is a low cost set up that can handle a fairly high volume of product.

However, the quality of the finish is dependent on the quality of the spray equipment itself and a trained operator using the system.

A dedicated conformal coating spray booth can help with the correct application


What technique do you use to spray the conformal coating?

Spraying any coating is a skilled process. This is no different for conformal coating.

The process requires training and knowledge to achieve good quality conformal coating finish.

For example, setting up the spray gun with the right amount of atomisation pressure and material feed is critical to ensure a good coating finish. Otherwise, conformal coating defects such as orange peel can be dominant.

Further, applying the material correctly in the right pattern and amount using a rastering method is also critical and requires training.

Finally, knowledge of blending the conformal coating to the right viscosity is crucial.

Both the wrong application method and viscosity can produce many conformal coating defects such as bubbles, runs, ripples, and capillary effects.

If no doubt get help and train to apply the conformal coating.

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For correctly spraying a conformal coating on to a printed circuit board there are two key factors to consider. These are the equipment you need to apply the material and the technique used to spray the conformal coating.


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