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Grease won't do any harm, but it just gets pushed out when you fit the bearings. Because they are a tight interference fit and grease is thick.
I've never needed to use Loctite on the bearings, only the crank spider, where it's absolutely vital to prevent noise and the spider wandering off :) You can use the everyday non-permanent thread locking compound blue for that. 242 and 243 seem to be used interchangeably in the tech guide, curiously.
Bugger. Well they are pressed in now. Will loctite next time around.