MBV mixes their ejuice when orders are placed so they're fresh.
Blue Moo I got tasted Yuk when I got it, almost dumped it, but put it to the back and forgot about it for 2 weeks.
Found it later when organizing things, and tried it again, yum yum, (just needed some time for all the flavorings to mix/meld together).
Mixed up some DIY Hangsen RY1, and tried after a few days, pure nothingness.
Been 3 weeks and now I can taste it at least, may need to add more though.
I learned very quickly about "steeping", "melding", or whatever it is.
My Orange Cream was clear when mixed, now it's kinda pink, although I vaped it straight away and was great.
Pina Colada was clear, now it's light orange, and tasted quite bitter at first, added some creams and 2 weeks later, smooth.
My nic level is only 2mg, but their sure doing "something" all right.
A lot of flavorings are different and need different treatment.
Heat will help to mix things faster but I'm more concerned with flavor loss from heat.
Tried the UC for helping mix, meh, IDK?
Time seems to be the most reliable for me, and I'm a noob and have only been in this for 2 months...