Interesting points about SailKote. My H16 had sliding jib cars (no bearings), so that was never an issue.
The main traveler used spindle bearings, no problems there either. I also used it on my main (Harken, BB) blocks, never had an issue.
Probably the best place I used it (as a lube for running rigging) was the line and corner casting cheek blocks for the jib traveler.
Mike