I've owned a RTT for over 5yrs and have had to replace the slider twice since. Those sliders do wear out
preventing the zipper from joining together. In the field I usually attempt to squeeze the slider opening a bit tighter with locking pliers, that works as a temp. Over the years I've found that dust,dirt rain, mud can get between the teeth of the zipper and cause problems. I clean the teeth with WD40 and that works. When it's really dusty and the zipper is broken, try duct tape around the tent following the zipper.
The sliders are cheap, but postage will kill you. I buy the metal YKK #10 from Sailrite.com
Did I mention my RTT is made in China? I dont know how durable the African zippers are.
Edited by ROVRMAN2, 07 July 2015 - 06:57 PM.