Neither good nor bad, if used very, very sparingly. A couple of drops on a soft cloth (old, clean tee-shirt, or kitchen roll..?) and wipe it on, count to three slowly, then wipe it off. Guitars don't need regular oil changes like internal combustion cars and motorbikes. As with many things, less is more. Wipe it on, wipe it off and get back to practising. (Clean hands when playing, and wiping down the strings afterwards, are a Good Thing. That's really all a guitar or bass needs...).