Here's what Mercury suggests for those of us with the Dreaded Mercruiser drives
Quote:
How can I prevent the propeller from sticking onto the shaft?
We recommend a liberal coat of one of the following Mercury Precision or Quicksilver Marine Lubricants on the propeller shaft: Special Lubricant 101, 2-4-C Marine Lubricant with Teflon, or Anti-Corrosion Grease. These lubricants are available from any authorized Mercury Marine dealer.
Note: Always use the correct mounting hardware and torque the propeller nut to the correct specifications. Verify the propeller tightness after 20 hours of operation. DO NOT operate the boat with a loose propeller.
I use The 2-4-C Marine Lubricant with Teflon. (that Triple Guard is good stuff too!)
More importantly, remove the props at least once a year and re-lube with your favorite waterproof grease. Leaving props on for a long time will have you using a "puller" to get them off! If you use it or leave it in salt water all the time you might want to remove them more often...(Mercury says every 50hrs or 60 days on a Bravo)
Cheers,