Steam Shower and Sauna
Where do I seal the shower once it has been built?
    We recommend sealing with a bead of clear silicone where the central control panel meets the back boards, and where the back boards meet the tub, but to leave the drainage channel clear for any moisture build up on the outside of the tub. It may also be necessary to put a bead of clear sealant along the top and bottom edges of glass panels where they seat into the frame. Finally, run a bead on the outside of the aluminum curved rail where it meets the tub, once again, leaving the drain chutes clear.

All areas are discussed clearly in the installation manual along with diagrams.