Ian,
I will have to try to find some Cabots.
Some tung oil I think is more like a Polyurethane. The stuff I have used is from Lee Valley.
Polymerized Tung Oil - Lee Valley Tools.
It takes a few coats to start to build up a finish. And it reveals the grain very nicely. Its fairly forgiving and that sign was the first time I have had any issues.
I have only used Watco Danish oil and it seems to never build up any finish. Maybe my can is old. I ended up using some water based Poly as a topcoat.
I do agree that oil is a great finish as you can touch it up and easy fix crap that gets in the last coat.
Thanks
Dave