I use Convatec SurFit 2 pc, with a Convex ring inserted in the wafer and I use the Eakin Seal in addition to the wafer. It comes in 2 types: Eakin Seal wafers, and Eakin Seal strips. The wafers come in a small size and a large size. I simply cut strips off of the large size wafers (pretty cheap to do it this way) and apply them to the sticky side of the wafer that you are going to apply to the skin AROUND the stoma opening making sure that it is pressed against the wafer esp around the stoma hole opening. Make sense? Made all the difference in the world for my wear time which had dwindled to 3 days. I'm back up to 7 days easily now!!!!
If your stoma is flush, have you ever tried a convex wafer? That is kinda what was happening with my stoma a few months ago. When I gained a few pounds, my abd contour changed enough to cause problems with my wafer... or maybe it was just the "grazing" I was doing!!! I wear Convatec Surfit 2 pc and was able to get a Convex Insert to pop inside the flange of the wafer before I pop on the bag. It forces the stoma to protrude out from the skin level just enough to help with wear time. It doesn't hurt and isn't really noticeable for me.
Using the insert along with the Eakin Seal was how I got my wear time back to 7 days --- and sometimes, I change at 7 just because it falls over the weekend and is easier for me since I do it first thing out of bed in the mornings.
The wear time was the biggest issue to resolve and these items worked well for me.