As of May 2013, this is my preferred recipe for making giant bubbles (at least under cool humid conditions). Under cool, humid conditions (let's say 50-65F and 70% or better humidity), I have created huge bubbles that last a long time for their size (some 6 foot diameter bubbles have longer than 30 seconds in my semi-urban conditions). I have not yet had a chance to try it under warm or less than ideal conditions alongside PEO or guar-based solutions. I will not be surprised if those solutions will work better in those conditions, but only actual testing will determine if that is the case.