I'm a researcher before using so, I
definitely looked into eJuice and it's idiosyncrasies before I bought ANY. In all cases, whether on-line or face-to-face, I was told, in no uncertain terms, "Age ALL of it. Shake once a day whilst aging and always give it a shake before filling your tank". When I asked about pre-mixed without nic, I was told to age it about 3 days to a week AFTER nic is added to make sure the "molecules bind properly". Hope this helps.
Keep on Chuffin',
(REALLY??? KC and the Sunshine Band? lmao)