I'm bringing this forward to add some important findings regarding this "clone". I have a couple friends who vape nothing but Prime 15. I came across this thread and told them I would make them some clone samples to try. The sample I made using this recipe is very close, according to them, but it lacked something. They gave me some Prime to take home so I could do scent and taste comparisons. What I found was this: Prime 15 (as well as many other Halo juices) has a very distinct "musty" note which is not only detectable on the palate, but tends to linger in the air. This is why many critics of Halo juice say it tastes like "gym socks". The clone recipe above does not have that signature mustiness. Another very important flavor note in Prime 15 is that of cocoa. It is very noticeable when comparing it to the clone. My final analysis of the clone recipe above is that it is very close, but lacks the cocoa and musty quality of the true Prime 15. Well I have some good news. In my research of the flavor molecules which enhance tobaccos, I came across two; Tetramethylpyrazine and Trimethyl Pyrazine. The description for each was similar, but what struck me was they both had the words "musty" and "cocoa" in the descriptions. I bought them both. Upon receipt, I opened each bottle and took a whiff. The Tetramethylpyrazine was musty and a little chocolaty with a dry coffee hint. It did remind me of Halo. I started to get excited. Then I opened the Trimethyl Pyrazine. My first reaction was "OMG, this is totally Prime 15". The smell from the vial (although 1000 times stronger) is exactly the same mustiness and cocoa which is so distinct in Prime 15. I am 100% certain that Trimethyl Pyrazine is the missing link to this recipe. I don't know if Acetyl Pyrazine is necessary, so I will make batches both with and without AP. I haven't made a batch yet and will post my percentages when I do. I just thought I should add this in this thread.
I don't even like Halo juice and personally enjoy the dannyv45 clone better as it has all the nuttiness without the gym socks. If, however, you are looking for an exact clone of the original Prime 15, the use of Trimethyl Pyrazine will get you much closer to the real thing.