How come you can let a new piece of Gargraves Flex sit forever and it will remain flexible? BUT, bend it and let it sit.....it is solid tight!
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It must be the same reason that Aluminum Foil, once crinkled, will not go back to flat 
Probably because when you flex it, the wooden ties move/wipe off the little patch of assembly oil on the rails onto bare rails, then the rail oxidizes and sticks to the wooden ties. The plastic-tied track seems to remain flexible. I like Bob's explanation, too.
If you let straight Gargraves flex track sit for a year or so, unless it is stored in a very dry climate, the wood ties will expand and you will not be able to bend the track. Once it is bent it seems even more stubborn to be reformed. Just a nature of the beast.
