Conformal Coating

Conformal coating is a process where a thin polymeric film protects circuit boards and its components. It is applied to electronic equipment to ensure reliability and long-term performance, and protection from adverse conditions due to its environment. The most common areas of protection include the following:

  • Dust
  • Dirt
  • Moisture
  • Chemicals
  • Mechanical Stress and vibrations

These coatings comply with an increase in dielectric resistance, as well as operational integrity. For applying them to circuit boards, the process occurs in various ways, like brushing, dip coating, spraying, and with a machine. Also, many materials can be used for these coatings, including silicones, acrylics, perylene, and urethanes. It is essential to note the unique characteristics of the coatings, so you can determine if they are suitable for specific environments or manufacturing situations.

Conformal coating can be a complicated process if you don’t have the right expertise. At Circuits Central, we have satisfied customers because we know how to implement conformal coating properly, and we follow the necessary procedures. Creating new products and devices are integral to any business, which is why you’ll want to take all the steps required to ensure your products are the best quality they can be.

Conformal Coating Procedure

These coatings are applied in various ways, like brushing, dip coating, spraying, and machine. Different methods of curing and drying are available depending on the conformal coating material. Nearly all modern conformal coatings contain a fluorescent dye to aid in coating coverage inspection.

At Circuits Central, we use on-site UV-cured, and air-cured conformal coating applied with automatic, robotic coating equipment with precision and repeatable results.

Types of Conformal Coating


Brushing functions by coating the material onto the circuit board and works for low volume applications and repairs. However, many professionals avoid using this type of conformal coating because it is cosmetically inferior and prone to deficiencies. The coating also is difficult to apply due to its thickness – skilled operators should apply it.


Spraying uses an aerosol or specific spray booth with a spray gun. It is best used for low to medium volume processing. If used by an expert operator, like the ones at Circuit Central, then this finish can be one of the best methods, as long as the circuit board is clean and there are no adhesive issues.
However, spraying does come with limitations such as an inability for 3D effects.

Conformal coating dipping

At Circuit Central, we know conformal coating dipping all too well as we use them on-site. This coating is best for high volume and is convenient since it penetrates each aspect of a device. We ensure that masking is flawless so that no leakage occurs.

Selective coating by machine

Machine coating is another excellent choice for high volume applications. It applies the coating to the precise areas of the board quickly and efficiently. It functions by implementing a needle, atomized and non-atomized spray applicator, or ultrasonic valve mechanization with the capability of moving above the circuit board.

When using conformal coating, you’ll want to leave it to the experts for the most optimal results. At Circuits Central, we have years of experience applying a conformal coating to devices. We know that our methods are effective at achieving a high performance, which is why we have on-site UV-cured and air-cured types of conformal coating. These are applied in the most efficient way possible: with robotic coating equipment that delivers results. To find out more, call us today at 1 (888) 821-7746, fill out our contact form, or send us an email at