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Double Bass scratch repair?

If its a dark varnish and the mark isn't too big, hit it with a black Sharpie. That's what I do... :p


The Sharpie is a good idea--BUT it can look bad if you hit it directly. I bleed the a brown Sharpie into a cloth like an old T-shirt and then wipe it on the scratch. It gives much better control.
 
Would any of these fixes negatively effect anything like, resale value, or if your luthier need to do a re finish of an area? and would the sharpie bleed through the wood?

Personally I think while one large scratch by itself looks nasty letting scratches show on your bass is part of the maturing process , and lets it become a beautiful antique bass over time.
 
Most "violin varnish" is shellac-based (with denatured alcohol or Bekhol as the solvent). If you're going to use a touch-up marker, you might want to consider applying a few coats of shellac to the damaged area first; the shellac seals and protects the raw wood, and with a barrier layer of shellac in place, if you aren't satisfied with the look imparted by a marker, you have a better chance of wiping it away and trying something else.

When I use "tinted" shellac to make cosmetic repairs, I usually seal any raw wood with super-blonde dewaxed shellac (like Zinsser SealCoat) first because it provides a degree of reversibility; by "tinted" I mean either various shades of naturally colored shellac (e.g., button, garnet, orange...), or shellac to which I've added Transtint aniline dye.

Hope this helps