Not sure IF DT will mix with other stuff as they all have their own unique properties. Best to keep it all in the family so to speak, meaning stick to the same brand or manufacturer to avoid things ending up in tears.

There are always a few exceptions and usually Tru Oil will go down as a top coat over most things if they have been given enough time to dry and cure properly. DT does not like going over the top of anything else other than timber mate used as a grain filler.