A skin barrier provides a thin protective layer of film on the skin to protect it from output. Depending on your needs, a spray or wipe may best meet your needs.
Common features of both products include:
Protection against stoma output and adhesives
Spray can be used for crusting technique
Dry within seconds
Won't build up layers or inhibit adhesion
Alcohol-free + silicone-based = sting-free
If you use a barrier film to "crust" (creating a drier, textured surface on otherwise wet, weepy skin by alternating layers of ostomy powder and barrier film), the Brava Skin Barrier Spray is a good option. It will "seal" in the powder to create a surface to which your barrier will stick.
The Brava Skin Barrier Wipe cannot be used for crusting, but still provides sting-free protection from leakage. The wipe is practical when travelling because of its size.