Are there any challenges to using Core Ten weathering steel in a project?

Core Ten is a natural product, unprotected by a warranty. As Core Ten starts to develop it’s patina finish, weather and humidity can cause run-off onto adjacent building materials, including other roofing and siding materials and where run-off reaches ground level, onto concrete and landscaping. This run-off can permanently stain these materials and affect ground and landscaping in an adverse manner. Also, Core Ten patina should be protected from passers-by in such a manner that run-off should be directed and managed away from pedestrian areas of travel.