Hey guys,
I tried this , but I decided I didn't really like it after I applied it on a few centimeters...
(The video shows how you can make your guitar neck faster by making slight scratches in it...)

I strongly regret it, and that's why I'm here to ask you if it's possible to get it good as new...

The only way to get it ''good as new'' is to completely strip it down and re-finish it.

The easiest way to get it at least looking consistent would be to go over it with some very fine sandpaper until you end up with a plain satin finish. Obviosuly it won't match any original high-gloss finish but at least it'll have a uniform look along the length of the neck.
Yes, I know everything. No, I can't play worth a damn.
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TS, never mess with your guitar unless, you are a technician, or if you know you can undo the modification.
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