Adding oil over water based finish?

Q: I recently had my oak floors refinished with water based poly. I would rather have had oil but because of time constraints at that time I opted for the water. I want to put a couple of coats of oil on top.

Can I just rough up the floor and add coats over water?

A: Yes, you would have to buff or abrade the finish to allow the omu to grab. I would let the water borne dry several weeks before doing this.