Recently I've been working on a power supply for an RC car. I am considering using this conformal coating on it:
I do not anticipate much moisture exposure aside from humidity but I'd hate to see that hard work corrode and I'd like to protect against short circuits too.
In general is it a good practice to seal a board with this conformal coating or another type of coating?
Also, I would like to brush it on but the datasheet says:
422C can be applied by brush for rework or touch-ups.
Thinning is not required for most brush applications.
Desired coating thickness can be achieved in a single
application. Applied coating can be cured immediately.
Otherwise it looks like spraying or dipping are preferred for the primary application.
I'm not set up to spray where I normally do this work and I'm concerned about gumming up buttons and such by dipping. To that point is there a similar conformal coating that can be brushed on? I have a heat gun on my bench so I can cure it or I can get a UV solution if need be.
The most important step is to clean, clean, clean before coating.
I use alcohol and then blot it with a paper towel. Unless you spray with alcohol and let the foreign material flow off, the blotting is needed. Usually several cycles makes it clean enough to overcoat.
As for needing a conformal coat. Any electronics kept inside can forgo coating. A PC motherboard is not coated, you TV is not coated etc.