This query is also on non-edible and there I have said that I have used bubble for a few years with no problems. I do make sure when I first put it up that I can open the vents, I use auto-vents which open as soon as the temperature goes too high.At the moment I am using coolglass, as I took my bubble down ready to replace next autumn,coolgalss is easy to put on and take off,whereas some of the others need almost scrubbing to remove.