I also used a top brand of Carnuba wax that is for my black '88 Mustang, but it seems to work better on the car than under the slide. That's when I used the parafin and it does seem to last longer.
You also might want to use it on the wood that the nylon pieces slide on. Little sandpaper, if you can get to the wood, and lots of parafin.
GO COUGARS
2001 Tradewinds 7390 LTC
330 Cat Turbo Freightliner Chassis
2011 Jeep Liberty(toad)
'88 Mustang 5 Spd 5.0L GT convertible (not Toad)