No,if it is thin enough to run the length it is thin enough to wick in to the wood.Just don't glue the frets in.I glue the ends after all of the frets are seated and rough filed and beveled with medium CA.It is thin enough to go a hair into the slots without running into the wood.Only reason I glue the ends is to seal out most of the moisture in the air
I wick in some thin CA if I find a gap--otherwise no glue.
As far as fretboard polish, it is just micromeshed up to 12000 so far. If you get something on it while fretting clean it up and re-sand the area in question. It's not impossible....even if it seems like it might be.
Brett, I wasn't suggesting you put markers on top of your beautiful fretboards, that's the sort of thing that would make you wander around in circles muttering to yourself.
On the other hand, most of the bass players I know do need some sort of special attention or something......
SR