oh i see what you're talking about. if you put tape over it, try to leave it smooth where the line is going over it off of the spool.
i've done it before with electrical tape which is smoother and it wasn't a problem.
Not sure what spinning reels you have but the vast majority now have an inline bering in the bail. With reels that have this feature you are not supposed to lay the spool flat to spool up. You are supposed to spool up the same way you do with a baitcaster with the spool standing in edge.