zipper repair

Hi all, Wanted to get opinions on repairing my old nova scotia semi-dry's zipper seal. The zipper itself is great and I've kept it lubricated so mercifully no issues with the teeth/pulling/etc. However as you can see the issue is the sealing around the zipper is flaking off (probably due to the...

A local police auction reseller sold me a used Viking Pro drysuit. It's a steal, but it has some issues, namely the zipper. The condition of the zipper when bought was far worse and I cleaned it up with soap water and used zipper wax. But I'm still worried about the seal, which is flaking off...