It is tempting to consider one of these parts in isolation.
However, this could be a mistake.
After all, the wrong choice can be devastating to the conformal coating production process as a whole and even worse, the reliability of your product.
I feel that to identify the best conformal coating material and application process there are several key factors that you need to consider that, if you are lucky, will add up to at least one sensible process choice.
Factors to be considered include:
Temperature operating range
International, customer or National Standards
Environmental considerations of the circuit board
Requirement to rework the conformal coating
Conformal coating material type
Application process considerations
Curing the conformal coating
National, State, Regional Legislation and Insurance