I will be doing the qwiso method soon.I have been doing a lot of searching on the method here as well on google.I plan on doing a couple of runs and mixing together for my mod box.I have got the filtering process figured out i thank but still not sure how to go about the purging.I thought i had it figured out to just let everything purge naturally with a fan with no heat but seems their should be heat involved in order to get all alcohol removed.Still not sure this is the case but looking to get a for sure answer.I will be doing all this in my rv with good venting with a generator involved.I plan on letting the majority purge naturally with a fan and than use something i dont know what to do the final purge.I understand i should try and keep the final purge temp to 100 to 110f untill all bubbles has stopped forming.I have never done this so dont even know this for sure.I would like to find something that i can place under the pyrex dish that will hold this temp to fully purge the product.I was thinking maybe a seeding mat or heating pad but not sure if the temp would be adequate to hold these kind of temps.I dont really wont to use a griddle or double boiler,Looking for something that doesnt go over this temp for sure.Any help will be appreciated.