Conformal coating?

[larrymoencurly]

What's the difference between conformal coating for circuit boards and other coatings, like acrylic transparent fingernail polish or spray acrylic enamel or urethane paint? Apparently the transparent colors don't conduct, even at high frequencies.

I just want something to re-coat copper traces where the original conformal coating has come off, to make it less likely that i'll create solder bridges.

[Krankshaft]

Re: Conformal coating?

I usually tape off the area and hit exposed traces with spray lacquer I'm more worried about copper oxidation than insulation value.

This is on the rare occasion I need to scrape the coating off to test a trace without tracing it all the way to it's termination point. Or if the end of the trace isn't easily accessible like on a multi layer PCB.

They do make PCB lacquer but it's pretty hard to find.

[PCBONEZ]

Re: Conformal coating?

It's Acrylic Lacquer
http://www.mgchemicals.com/products/419b.html

Fingernail polish has all sorts of other crap in it and no two brands the same.
http://en.wikipedia.org/wiki/Nail_polish
I'd read the labels in depth and if it doesn't say then keep looking.

They got it but it ain't cheap
http://www.mouser.com/Search/Refine.aspx?Keyword=conformal+coating&Ns=Pricing|0&FS=True

Thanks for asking. - I kept forgetting to look that up.
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