I was trying sawdust+glue hole patching because I'd like to patch the existing (presumably) epoxy glue lines on the neck better. 5 scratches: CA, Titebond, Titebond + fish glue, fish glue, epoxy. I wiped the result with some oil to simulate finish. In sunlight, CA and epoxy are really dark and stand out, other glues are fine. In shadow, however, they stand out quite a bit. But so does CA and epoxy: I'm not sure what to use. Perhaps even titebond with a touch of stain?