Homebrowing my transdermal carrier I would like to use isopropyl alcohol 70% (mainly because I have a lot of this left) instead of the usual 99% in Chemo's recipe. But in one of his posts Chemo said that if isopropyl alcohol 90% is used instead of 99% then PEG400 should be added to the mix. Do you think that will also work with isopropyl 70%? if so do you know how much PEG400 should be added to the mix? Should it be added instead of certain percentage of the isopropyl alcohol or in addition to all ingredients?