Like anything boat related..
Bad Obsesion,Like anything boat related the longevity of StrataGlass is in direct proportion to the care it's given. I do consulting work for a very high end custom canvas guy here in Maine and we've seen Strataglass last 9-10 years and still be optically clear. The StrataGlass on my boat was exquisitely cared for, per StrataGlass' instructions, and is now 8 years old and still very, very clear!All that being said we've seen customers ruin it in a season usually from using improper products or care techniques! Here's some things to keep in mind and consider about StrataGlass:1) StrataGlass is a coated product, this is what makes it so optically clear and distortion free. So NEVER use abrasive cleaners other than what the manufacturer recommends.2) This optical coating is THIN!3) Never clean StrataGlass with paper towels an use ONLY clean soft terrycloth or CLEAN soft microfiber rags.4) Never ever use Pledge, Rainex, 303, Armorall, 210, Windex or any other product not approved by the vendor.5) The ONLY approved products for use on StrataGlass are made by IMAR. They work and they work very well and when used as directed do not harm the coating. the manufacturer has tested many products and has come to the conclusion that IMAR products will uphold the reputation StrataGlass has earned.6) IMAR products are NOT made by StrataGlass so they get no benefit other than upholding their reputation as a top notch, long lasting optically clear window for marine use.7) Never use detergents or "wash & wax" products or soaps on StrataGlass.8) Use IMAR Yacht Soap Concentrate for washing the windows. I have extensive experience with IMAR Yacht Soap and it is a wonderful product for washing your boat & dodger glass because it does NOT eat the wax on your hull like most soaps do. I'm still beading after six months and I wash my boat at least once per week during the season. I've yet to find a soap that actually cleans but that also does not destroy the wax like IMAR does.9) The use of cleaners, polishes, scratch removers, or any other product made for regular, uncoated vinyl will damage StrataGlass. Do not use these products.10) Use IMAR Strataglass protective Polish roughly every 1 to 2 months depending on condition. In the interim, use IMAR Strataglass Protective Cleaner frequently as in once per week.You've heard my suggestions and personal experience with IMAR products but the manufacturer says it best!Striaght from StrataGlass I did not write this:"We recommend using only IMAR Products. IMAR Strataglass Protective Polish, IMAR Strataglass Protective Cleaner, and mild soap (preferably IMAR Yacht Soap Concentrate) on Strataglass. (We no longer recommend the use of any other products, regardless of the manufacturer's claims.) Use of harsh cleaners like Simple Green and/or pine will dull the curtains quickly.After September 30, 2004, using any other product(s) void the factory warranty" And:"Restoring: We once recommended a restoration process but extensive experience shows actual damage cannot truly be repaired. If IMAR Strataglass Protective Polish cannot restore the clarity and shine, it may be time to consider replacing the enclosures. Please...Please...use our recommended procedures and products from the beginning."It's sounds like you know what you are doing and I would expect that you could easily get another 4+ years out of those windows providing the thread holds out..