thanks babygro.... but Im pretty sure I know "how" to put up the stuff.... its not mylar, and its not foil either...
if you had read any of my few previous threads you would understand that I had to tear my whole grow room down due to the ballast burning out.... I didnt know what it was burning so I had an electrician come by.....
prolly wouldnt be a good idea of leaving lights and reflective material up....
so I re-applied it, yes, it got wrinkly.... the main point of that being there is not for reflective purposes only.... it covers a window so that there is no escaping light at night time..
plus, its not even that close, hardly any light is hitting it anyways.... thanks though for your insight!!