I am always asked if Pond Shield epoxy can be used as a pond liner glue. The short answer is no. I hate to disappoint, but while there are times Pond Shield epoxy can be used in the same manner as a glue, it can not be used as a pond liner glue.
The real issue here is not that Pond Shield is not sticky enough. It really is. The issue is that the epoxy and the liner are from two very different families of materials, in the case of a rubber liner.
While Pond Shield sticks to PVC and ABS pipes, this does not mean that it will stick to PVC liners either. The problem here is the difference in material flexibility. All flexible liners are going to be on the furthest edges of the scale with is comes to flexibility.
So in essence, it amounts to two major issues, the family of materials and the flexibility. If you want to use a pond liner glue that will have any success of working, the pond liner glue needs to cover both of those issues, being of the same family of materials and at least as flexible.
The down side of pond liner glue is that they can be tricky to get to work properly. If you read my article Patching a Pond Liner, you will get a better understanding of how this process works.
You should be aware that pond liner glue and patches do have their issues even if you follow the rules with repairs, so you will want to take care of them and treat them with extra care so that the patch lasts as long as possible.