Hi Bob,
I use a thin lithium based grease that has the consistency of butter. I use it on my cnc router rail bearings and on my laser rail bearings. It's made by CRC Industries, STA-Lube brand name, part # SL3310.
It's difficult to grease my laser bearings though. Not sure what type of grease fittings those have on them but there isn't enough room to get a regular grease gun fitting onto them, if it would even fit. I had to unscrew them and use a needle point grease gun end pushed up tight to the hole where the fitting was removed. That's the only way I could get any lube in them.
HTH,
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