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Just chatting, have seen and talked about here that Ali posts stuck in steel frames after using grease.
Seen enough alloy wheels corroded to steel hubs with copper grease slathered on to use the appropriate grease. The days of one or two greases are long gone.
Occasionally wondered about using marine or waterproof greases in these situations or ceramic greases.
Have been told that I'm using the wrong grease by using waterproof greases in wheel and bottom bracket grease.
Do like the lucas (not the electric Lucas) green n tacy and the red n tacky. Greases
lynx-
For alloy post in a steel frame I use some kind of anti seize with zinc in it. Usually thick white or grey stuff. You can basically use anything, so long as you remove seatpost and give it a wipe down before and after every winter, even for a bike in daily hard use and kept outside you should be fine.
Its folk who get a new budget steel frame like a genesis (since 2016 they just aren't finished as well in side thr seat tube), and whack a budget painted (instead of real anodising) alloy post into it. Thing seizes within the first year. Seen dozens and dozens of them under a year old and already chemically bonded to the frame.Worst ones I don't see much anymore. The cheap ass carbon wrapped uncoated alloy posts you used to see on budget spesh and trek bikes way back. Water gets into the post and corrodes the alloy (but of salt and sweat helps the process nicely), it expands by a tiny amount inside the carbon wrap and swells into the frame like a rawl plug. Cut out or if really bad can split the seat tube.
BrickMan
Never seen any evidence of it on joints assembled with Copaslip, whereas I've seen loads on steel/aluminium interfaces assembled dry. By all means use Alumslip if you don't already have Copaslip to hand, it's probably even better.