Most Vaseline products are petroleum based. If their lip therapy is, a wouldn't use in a vaping device or on any o-ring. Formulation...I keep it simple.. Vaseline "Lip therapy" it comes in a tiny tube at your local drug store. It's unflavored. I can only "assume" it's food grade quality cuz it's supposed to go on your lips....Lol. I have all the original o-rings still on mine from almost a year ago.
As far as builds, I've thrown about everything this tank can fit in it the past year... and this is what I like best and settled on for the KF5
Try this.....
28g Kanthal 2.5 id (perfect size for cotton wicks in the well)
6-7 wraps
Mtl reducer kit (smallest reducer)
Add some high nic juice and enjoy
Simple and flavorful vape
I'm going to try some alternate wicking today. The Vapors Choice cotton (VCC) is strand type, which I'm not sure in the best choice for wicking. It's decent, but not consistent. I have some organic Japanese cotton that I'm going to try next. I'm also going to increase the coil size from 2.5mm to 3mm.