Do boards have to be cleaned before you apply conformal coating?

*Maybe.

Does it depend on what type of flux is used?

*Maybe

Example would be no-clean flux, you can apply conformal coating over it
right?

*Maybe

And you can quote me on that....

Doug Pauls
Rockwell Collins

OK, to be a little more helpful.  If your boards and components are "clean
enough" as they enter your process, and if you are using a "benign enough"
flux, and your coating of choice "adheres enough" to your flux of choice,
then no, you don't need cleaning, i.e. a true no-clean process.  Deciding
the "enough" part above is the big trick and it varies from application to
application, end-use environment to end-use environment, and site to site.
There is no easy way to answer your broad broad question.

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