Join Date: Jun 2003
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Why do rear window zippers rip out?
On a soft top, why do rear window zippers tend to rip out eventually (in my experience)? Is it because the thread dry rotted from UV exposure, or is it because the top shrunk and put a lot of stress on the zipper? Initially I thought it might be caused by sun exposure, but now I am not so sure.
By the way, if it's caused by the top shrinking then sewing the zipper back where it was may not be such a good idea. It seems to me that a better idea would be to sew the zipper onto a canvas strip, maybe 1.5 to 2 inches (4 to 5 cm) wide and then sew the canvas strip onto the top. That way, there will be a bit less tension on the zipper when the window is zipped closed.