The Rosin way of doing it I say is very much like how I have made it before ,I use a shot Glass in the bottom of a saucepan with simmering water in ,Add Mono Propylene Glycol to the shot glass heat it through ,then add the Rosin till it Desolves any thing that got through contamination will cause a dark cloud in the bottom allow to settle the just take top of it, but honest every bit I have ever made has never been cloudy .But if you have a high Tolerance then stick to there 3.5 gram of rosin to the mixture.Your best of watching letvape.eu,on you tube they sell the tops so you can just have them ready to go ,plus everything else you need .you need the concentrate bungle Enjoy.It what I will be making in a few week,full plant going to rosin ,from that vape oil