The only problem I've ever run into with pickguards is static buildup during the dry winter months up here in the Northeast. But since I put a good evaporative humidifier here in my man cave, that hasn't been a problem. Have also heard of people rubbing the surface of the pickguard with dryer sheets like Bounce because they're loaded with an antistatic compound.
I've never had nor even heard of problems with back covers.
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“My favorite programming language is SOLDER” - Bob Pease (RIP)
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