If we're talking the actual taper itself, that the crank arms bolt down onto, then no.
Fitting instructions of my most recent bb's have said no..
I've stripped bikes that have never had the cranks off in 20 years and even without grease there's been no metal binding..
If you really want to use something, a quick wipe over, with some release fluid (loctite 700, 770, etc.) would probably be ok...
If it is a Race face crank then yes you use an anti seize of some sort, says so in their instructions and their cranks are machined with that extra layer in mind.
Just pop in the archive and have a read.http://www.retrobike.co.uk/gallery2/v/M ... e/Manuals/
NOTE: WE RECOMMEND APPLYING A FILM OF
WATERPROOF GREASE TO THE BB SPINDLE
FLATS BEFORE INSTALLING RACE FACE CRANKS
TO HELP PREVENT CORROSION THAT CAN
OCCUR BETWEEN THE CRANK TAPERS AND THE
natural movement between the two parts and can
adversely affect the life of the crank arm. While this is
a controversial area , our extensive lab testing has
proven that greasing the spindle flats does not
adversely affect the crank arms, while preventing
corrosion has definite benefits. Cranks tend to "suckon" to a greased spindle approximately 0.5mm
(0.020") further than they would onto a dry spindle
using the same torque value (28 ft/lbs. max.) on the
crank bolt. We have taken this into cons ideration in
the CNC machining of our tapers to ensure it is not a
Lubricating the spindle flats is especially important
when using a non-plated steel BB spindle (Shimano
UN52) or a Titanium BB spindle, as corrosion attack
is much worse in these cases.