I'd like to do some temporary quick patches to prevent worsening rust and separation of spalling/stucco ceiling underneath a steel outdoor porch/deck. One on the first floor is kinda bad so will require it to come down and be replaced, but the 2nd floor is still small and can perhaps be patched. What kind of caulk can I use to waterproof seal and optionally to help glue the corner up and prevent the rest of it from sagging further?
Additionally, what kind of contractor should I be looking for if I want the first floor ceiling to come down and be replaced? What is a reasonsable price to remove ceiling, scrub rust and either leave with rust proof bare steel or new concrete like ceiling?