Refinishing Hunter Teardrop Galley

Anyone know what type of clear finish is is used on the Hunter teardrops to seal the birch woodwork in the galley and/or in the cabin?
Some type of urethane no doubt.. but what?? Water or oil based? I have some areas to redo that have been slightly damaged by water/weather.
Tnx!
Some type of urethane no doubt.. but what?? Water or oil based? I have some areas to redo that have been slightly damaged by water/weather.
Tnx!