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But for a proper test, you need to put a coat of primer and paint over it.
Again, I don't see how it will breakdown with a protective coating. I could
see it breaking down if it was a bare coat of material exposed.
Tim
And in a former life, I used to develop systems to shield composites
from EMI. One technique used was and still is conductice treatments
including zinc arc spray and silver or nickel based conductive paint.
The surface treatments usually showed better performance initially with
40 dB possible. After simulating aging of a couple years under indoor
conditions the results were quite scattered, and usually quite a bit
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