I've ben mixing for a bit now and when I mix I make a lot at one time , saved the bottles from the old
juice and I use them to brake my
juice down to usable vape . So I end up with 2500 ml of
juice all the same nicotine level , put some in the freezer and mix up 5 to 10 30ml bottles of juice most of what I make can be vaped now or within a day or so , some takes weeks .
Always use a good calculator when mixing juice but the biggest thing is that it all must be clean very very clean .
Best wishes
H