I have used lithium grease in a high pressure rattle can and a long straw wand.
Fresno is talking about marine grade grease which repels being washed off by submersion or water movement - used in marine prop shafts / boat trailer wheel bearings immersed in/out of water. It maybe a little heavy and sticky for the sliding roof rails though....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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