[oh'mike]

The nails or brads will shatter the finish---sooner or later---

Install the bar rail first or add a nailing strip to the edge that is as thick as your pour and wide enough to support the bar rail.---Mike---

 

[SoCalLivin]

What about screwing up through the bottom of the bar top into the rail? (obviously using appropriate length screws as not to pierce the surface of the rail)