Signing statement with master key?

Cannon cannon at
Tue Aug 9 00:29:02 CEST 2016

This is a hypothetical scenario.
Lets say if I have a keypair.
The master key is set to SC (signing and certification) which are the
default settings. The master key pair is only used on airgap with safe
data transfer between airgap and network connected computer.
Is it safe and possible to use the master key (not subkeys) to sign a


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