sealing tang holes, mast water leaks

[jjoiner]

Hi, I have a mast with tang fittings and internal halyards. It is keel stepped and I get a lot of water in my blige from the mast. I'll use spar tight for the external leaks and maybe a mast collar just for good measure. Is it okay to use caulk for the tang holes in the mast? I have 4 sheaves at the base of the mast for halyards to exit to turning blocks on the deck. Should I fabricate a dam just below the halyard exits? Would I have to pull the mast for a dam fabrication? Thanks. James