Member Since Oct 23rd, 2010
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Oct 23rd 2010 4:53PM Don, you are absolutley correct in your warning. I've been in the glass business my whole life. Window film is great for single pane glass but can be harmful to insulated glass and DOES void the warentee. It can cause heat related stress cracks and seal failure. The film companies know this but rarely warn consumers. Some of them offer thier own warentee for an addtional charge if you ask about it.