I'm sorry for not being specific.
The guitar is a Cordoba Pro-R and the US rep for Cordoba (Tornavo Music) when contacted told me that the finish is nitro poly.
The scratches that I'm trying to drop-fill are two shallow but long ones (~3"). However, they are deep enough that I have not been able to polish them out. The wood is not cracked. I checked the inside through the sound hold.
The small mark just above and to the right of the bottom scratch is not a scratch. My guess is that the guitar went through a rapid temp change and the wood swelled a bit causing the finish to crack.
I was planning to drop-fill with nitro lacquer along the crack with a pin or a sharp tooth pick. Allow the lacquer to melt in. Give it a week or so, then take off the excess with a scotch tape protected razor blade, wet sand and buff.
I've read the archives on this forum as well as other guitar refinishing forums. I'm pretty handy with tools and have done small automotive refinishing so I'm familiar with paint drop-filling, wet sanding, and polishing techniques.
I was just looking to find a place where I can small bottle of lacquer and maybe some suggestions on the lacquer type and brand.
I would appreciate any pointers. Even if it's to just leave it alone.