I can hear ya AttyPops... I was away for a while because I was mixing my lovely "Dark Fire" liquid.Bull. Ya can never find an Old Chemist when ya need one....... <Shouts out into the air> "Hey O.C........"
Any validity to the cap off crap/rumor? Too many people ruin/spill juice. Maybe for a short while... if any volatile stuff evaporates off.....but... I say cap on most of the time. Bigger = longer steep? Nah. How do these rumors start?
Well - if you remove cap, you'd let more oxygen inside. Oxygen is not very good for nicotine, as it oxidizes this chemical.
In my personal opinion one should leave your mixture (assuming that it is DIY stuff) overnight. Ad that's it. But it strongly depends on the flavors. If we refer to liquids from different suppliers - they're ready to use. No need of playing with caps etc.