ZBrushCentral

Radial sym with z mirrored?

This is for 3D printing. It seems simple. I start with a very thin cube 30x20 x1.5mm. z symmetry with m, works fine, I see applique both sides of the “sheet”; add radial sym with z and m still set. Now the radial applique is only created on the one side. Is there a way to get radial sym on both sides of the sheet?. Maybe a different approach is required. I really just want to apply clay tubes brush and it to be double sided. The surface that it is on is not wanted in the print. Mirror and weld adds complications.
I don’t want a sheet or thin cube there anyway, just want to print with the clay brush, with double sided radial symmetry. Radial+Z+M

Thanks!