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I believe thats just to get the lacquer coating off. Almost all electronic boards have it to help reduce corrosion. Either its so thin it doenst stop electricity or maybe the heat of solder melts it. I never scrape mine and they work fine.
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HAL3000
959.1 Zigahertz
768 Terabytes PC 2,200,000 RAM
Dual Geforce15000 2044 MB
85" holographic plasmatron 5000
and a hot sexy voice
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