Yes, both Brava Strips and Sure Seals are and additional adhesive that goes on top of your wafer and extends over the edges for extra security and water proofness. They are different from each other though...I have used both and each has pros and cons.
The Sure Seals are one big, very thin piece of adhesive with a hole in the middle that allows it to go over the flange and onto they wafer. They are very flexible and water proof.
The Brava Strips are two half circle pieces that go around the edge of the wafer. They are thicker than the Sure Seal.
Here are links to both. You can contact the companies for free samples.
www.coloplast.us/brava-elastic-tape-1-en-us.aspxwww.alpglobal.com/Sure-Seal-TM-Rings.html