Perimeter bulkheads tt bullnose, beams were framed with steel and finished with tt 90 bead. Fireplace built with steel and finished with both 3\4 tt bull and 90 bead.
Cement board, drywall,1/2" reveal, splayed 350 bull.
I wasn't able to use vinyl product in the confined space of the fire box. Cement board, used Trim-Tex 3/4 arch to cast sheetrock 90 covered with saran wrap. Trim-Tex 3/4 bull, l bead, adapters, 3/4 radius j bull, double layer drywall. Heavy coated whole surface for scribe, used 80 grit to purposely leave circular sanding marks on the surface.
Cement board, drywall, Trim-Tex 3/4 bull, 3/4 splayed bull, loaded whole surface on this one, scribed detail throughout.