Don't see why it would be diff than for alcohol. Fill with water, staves swell and leaking stops, also clears out any loose char. Drain water, fill with material. The bands are sized so the staves can swell tight and not leak.
Whether it's much better than glass is def not settled science, and whether a barrel preused for rum or bourbon is better than fresh also unknown.
So fill with water to swell to size, drain, fill with rum, let it age (faster than full barrel, generally 1mo = 1yr equivalent vs 55 gal), so 1-3 no in barrel, drain, drink, fill with patch, then give it years or whatever
The thinking on barrel is it does breathe a little, minor o2 exchange and more evap for thicker patch vs oak in glass. But no real comparison or validation that I could find for patch specifically