I have a PVC Hybrid sump. The top bracing has a small hairline crack between the sock section and skimmer section. Im pretty sure its not a major part in holding the sump together as much as it is for holding the lids in place. My question is, what can I use to mend the crack for PVC material? I have some weldon stuff from fixing an acrylic sump in the past but not sure if that will work with PVC?