Hi Elif, I've been able to get this to seal with the barrier paste and as you say cut the hole exactly the size of the stoma, but only 36 hours at the most. After that it leaks. I've visited my surgeon and she was shocked, immediately had me sign consent for surgery to do a revision, the stoma has recessed so badly. In the mean time I'm going to order the Coloplast Sensura Mio convex. I have to make it three weeks before the revision. Thank you so much. Brian