The paste shouldn't hurt the stoma at all. 6 days is excellent wear time. If the wafer is not breaking down and you don't feel "itchy" under it, that's how you can judge if 6 days is ok or not. It's hard to give you the black and white answers you are needing without seeing it, and I'm certainly not a doctor. I'd say hang in there until you can get someone, it your ostomy nurse or doctor, to look at it. Paste wouldn't cause damage to the stoma - you are using it for protection to keep feces off of the skin surrounding it. Does it hurt at all?
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery