Hey Michael, we understand your concern regarding proper shim installation Andrew is suggesting. Though he mentioned ABS I'm sure what he meant was the process of creating one seam, not necessarily using ABS paste on PVC. Before anyone knew about ABS paste there was the lingering question "How do we accomplish this?". We're always looking for pioneers to pave the way, maybe that's you, who knows. If you Google plastic repair there's a whole host of ways to fill in seams on different types of plastic however, as we always state "the accuracy of the armor is ultimately up to you".