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possible to restore this without replacement and breaking the original seal?
NO. Your mylar has died, it's going away, you can replace it but I've never seen a way to restore what is there. You can maybe cover it, but it won't last as long as it took to cover it. If I had no leaks and wanted to keep my rubber seal, I'd either learn to live with it as is, or just carefully replace it.
If you decide to replace it, use a rubber lube like RuGlyde ,... and be extra careful at those four Stainless Steel corners, use a dull plastic tool ... no sharp unforgiving screw drivers, they have a lip on the sides that inserts into the rubber channel over top of the mylar, they too can cut the rubber. There is a tool for inserting the mylar lock strip between the corners. Mylar will shrink in time, so a little long is better that a little short, as I saw as my truck's mylar drew up shorter showing gaps after my 1989 redo. Try not bend the mylar a lot, it'll wrinkle.
You can get the lock strip in black. It isn't chrome looking, but it doesn't peel, wrinkle, and turn white, etc. The mylar look stuff has layers that the black doesn't have. Your rubber is likely got some age on it too. Black today likely will look better 10 short years from now.
Last edited by tbear853; Oct 3, 2025 at 10:43 AM.
Reason: added words
You will need to polish your stainless corner pieces but the lock strip you can buy by the foot. you'll need the installation tool, and I use window cleaner to make it go in easier. on a really old hard gasket you may need to use some heat and a better lube.
The earlier model wide trim is all stainless but is completely different.
Tkx for all the advice. Because the truck is all original, I believe ill keep it the way it is. Probably from all its az years. I hand polished all the paint with 3m Finessit then had the entire car ceramic coated to save the paint. Tkx again. J
My only concern would be damage to the rubber, but that Ru-Glyde is slicker that snot, and we know the rubber fits, so probably be easy enough to replace. Last lock strip I used was on a one piece roll, not precut (a good thing). I used a pair of cutters that have a 3" long razor blade (is replaceable) and cut it as I found I needed after starting at one end. Try not bend the lock strip backwards and you'll minimize or eliminate any wrinkling.1977-1979 Ford F-150 Lockstrip, Chrome | Online Store | Car & Truck Interior Carpetfor example,but it's found at all the usual suspects including Amazon, Ebay, etc. Tool too, if you want it, cheap enough to try.
Last edited by tbear853; Oct 4, 2025 at 12:45 PM.
Reason: add link
X2 that locking strip and what ever it is made of and or is properly called, looks to be worn out, shot, weathered. You can get new and pull out the old and use the proper tool to put in new. Only the 4 little 90* corners pieces are stainless steel.
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