I looked everywhere for a total blackout film that didn't leave brown patches through, and was pleased that I found this. It costs more but it is true 100% blackout film. Husband is a shift worker and he needs to be able to sleep during the day, and this allows him the darkness he needs. Also, as other reviewers have mentioned - if you find light seeping through on the edges of the window where you cut the film at the window frame, black electrical tape is a great fix.
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