I have no experience dropping a keel other than as sidewalk supervisor
removing a fin from a Hunter. One thing I did learn was not to use 5200.
The boat was on well braced stands with a fork lift holding the keel.
Everyone thought that once the nuts were removed from the bolts it would be
a simple matter to just lower the forklift. Not So! The 5200 held the keel
firmly. After much nerve wracking wiggling they finally had to saw through
the 5200 and then spend the better part of a day scraping the joint
surfaces.

I expect that are situations where 5200 is an appropriate choice... but I have
not come across any myself in 30+ years of sailing and working on small boats.
Alexander "Ali" Meller
http://www.sailing.org/int505/