Fine Woodworking August 2004 has an article that might help.

Chip off the Ol'Proc wrote:

After I have 3 coats of Poly on the wood do I finish with a wax?

The can doesn't have any directions about what to do after.

Also I'm having problems with getting rid of brush marks. Any
suggestions how to make the Fast dry poly more self leveling?
Thanks,
Chip