How To...
...Fix The Mess You Made
(You do know you are only meant to sand the tip don't you?...)
Most cues I see have suffered minor/major scratches on the wood and ferrule. This is due to incompetence or carelessness when re-tipping, and can be easily avoided.
But don't panic, it is relatively easy to repair. Watch the video below if you want to sort out the mess you made...
The same methods can also be applied to scratches anywhere on the cue so it's a worthwhile lesson to learn and, once you've fixed the problem, avoid doing it again by learning how to re-tip properly here.