Can a deep scratch Be Fixed?
Small scratches can usually be rubbed out with polishing compound. ... For deeper scratches, polish isn't abrasive enough to fix the problem. For a deep scratch that's visible even when you wet it down, you have to physically sand the area with a solid abrasive, such as sandpaper.
How do you fix a deep scratch on an acoustic guitar?
To fix your guitar scratches, you can wet down a piece of 1,000-grit sandpaper with water and soap suds and lightly sand down the area with the scratch. Keep in mind, you only want to sand down a little of the topcoat of lacquer–nothing more. I usually start at 1,000-grit and work my way up to 12,000-grit sandpaper.