that`ll work, keep spinning the bearings by hand, if its not not perfectly smooth its got junk in it, air can be used to dislodge that shit, if the crank is going to sit for a while before install, as said used oil or WD to stop any rust developing
DONT spin the fuck out of the bearings with compressed air, if you shatter a race you might just lose an eye
so this crank copped a bunch of deto?