Once you've decided to use conformal coating for your device, a question that often comes up is:Read More
Parylene Coating Blog by Diamond-MT
The quality of a conformal coating job is directly related to the cleanliness of the substrate that is being coated. Clean substrates coat well, and contaminated ones don't. The only way to manage the problem is to inspect and clean the board or other item before applying the coating -- once it's coated, it's essentially too late.