To tile steel in internal and external locations, including wet areas, use ARDEX X 60 PU FLEX applied direct (without priming). It will dry in 3 hours and can then be grouted using an appropriate ARDEX Tile Grout.
Alternatively, in indoor & dry areas only, prime the steel using ARDEX P 82. Once dry, it can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.