OK peeps found out myself with a bit of searching. Found this in one of Mawsley old posts
Acetyl Pyrazine (05% PG) You do need to dilute it to around 4 drops in 6ml then use one drop of the dilution per 5ml of ejuice. Now you can see why it lasts forever. Its the bready and graham crackerish note you have been looking for . Its the ultimate enhancer for a graham cracker flavoring or even a popcorn flavoring as well as all types of cinnamon rolls,cakes,cookies etc.
If you've got TFA/TPA Acetyl Pyrazine it comes as a 5% solution no need to dilute further. Unless that's what the recipe states?
That's what I got from the thread too.Just read most of that thread from ecf and still none the wiser. Some say dilute some using it neat 5%. Trial and error I suppose