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If your sun visors have opened up at the seams, here's what fixed mine.
Just squirt in Elmer's glue, then clamp it shut over night. To prevent the clamps from making permanent marks on the visor, I use those free paint stir sticks you can get at any hardware store. So squirt in the glue, put the stir sticks along the top and bottom, then add clamps.
It's only been a few days, but it feels pretty solid.
No, it doesn't help with the stiffness. I suspect the stiffness is the same reason they split open, because we are overtorqing them trying to move them around.
I've never had any car with sun visors so messed up.
I have one starting to separate, but haven't looked into fixing it yet. Someone mentioned on Facebook a few months ago what they used for glue, but I never saved it and don't remember. Crap.
The paint stick under the clamps is a pretty good idea, though.
Contact cement.
Separate the two surfaces, mask where you don't want the contact cement to stay, carefully swab the contact cement on the two surfaces you want to join, let the cement dry for at least 15 minutes (until the gloss is gone and the surface no longer feels sticky), then squeeze the two pieces into one. Shouldn't be any need to clamp, but if so then the paint sticks will be handy.