I've got an old old 8/8s W&B wege, and the old black horn scales are in very good shape - maybe one little bugbite. But the scales seem dry, particularly now I've used it and gotten them wet.

I don't want to replace the scales. No cracks, they are perfectly weighted etc. But is there anything I can apply to them to preserve them and protect them from water over time? I've heard of tung oil but don't know what it is. I've applied the ballistol I apply to my blades, but don't know if that's doing anything.