The main reason keeping me from getting the 3M window film is the seal failure issue, so I looked up their warranty. Based on what I found, it is only for 40 months (see below) which is not very long. You mentioned paying extra for the warranty whereas what is quoted below is included with the product. Is there an extended warranty option that 3M offers? Or could it be that the distributor is the one offering an extended warranty?
Quote:
Seller also warrants against glass failure due to thermal shock fracture or seal failure, (maximum value of $500 per window) caused only as a direct result of the application of 3M Sun Control Film provided the film is applied to recommended types of glass and the glass failure is reported to the Seller within the specified time (listed below) from the start of the installation.
• Sixty (60) months coverage against thermal shock fracture
• Forty (40) months coverage against seal failure if covered by original manufacturer
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http://multimedia.3m.com/mws/mediawe...20Warranty.pdf