Not sure if they are slotted or not, but that is the best course of action. Chemicals and powders will make everything slide better or keep the rubber pliable, but they won't create the friction required to turn the flap as the slides move. Either your slide needs to go up, or the seal needs to come down.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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