I guess that would depend upon if the bearing was originally packed with clay based grease. Those absolutely do not like to be cross contaminated. It will get sticky and generate heat. Those are typically sealed with viton clad side seals. The ones with plain old tin sides, they should be greased regularly, the mfrs have moved away from that practice saying that the excess grease will draw in dirt. If it is flooded with lube, I fail to see how it will be drawn in. I still believe in daily grease. Grease to purge, wipe off excess, let her rip.
With all that said, no one will even wipe off a zerk before lubing, let alone wipe off excess.
NO MOLY GREASE IN A HIGH SPEED ROLLER, EVER!