Any primer in these is used for pre-wicking so that the unit is primed on your intial drags, its not a bad idea. These normally have no 'funny' taste as it is simple VG, it could be PG but from what I understand it is VG used to prime.
Thanks I'll give it a try and see how it goes. I'm using a 1000 mah ego battery or a riva battery. juice is nhalers menthol juice. Not thin, but I think his nhale/xhale juice is PG.
The reason I asked about cleaning is because I watched the video and he mentioned he should have cleaned it first. I've not used these before and I didn't know if there was some sort of primer that was giving the burnt taste.