this is what I do.
I take the old one off and get a new one, I put paste around the wafer opening where the stoma goes through, then I spray the wafer with medical adhesive spray and then I also spray my skin where the wafer goes, I wait until it gets sticky and then put the wafer on, I hold it there for a few minutes to make sure it sticks well. My wafer last for about a week maybe a few days longer.
I hope this can help someone. I have a two peice system
Diagnosed with colonic inertia at 13 years old, had my colon removed
Diagnosed with rectal inertia at 16 years old, had my rectum removed and had a jpouch made.
Diagnosed with small bowel inertia at 18 years old, and got an ileostomy wich I still have.
If you want to know more, just ask me!