Thanks all!
Yes, the amount of wd40 was not huge (alittle actually, but it stained the rhino anyways) as I didnt apply it directly to the hilt, rather it creeped in while I was cleaning the blade :P
So coconut oil, I'll get some tommorow and apply it to the horn. But how? do I just dip it in the oil? I'd rather do it right as I feel like a total dufus for forgetting to cover the hilt and seal it.
Gene, I'll post them tommorow, need sunlight