Gardener. I go with Digger. If the panels are PVC the pipe cement will work. But use the good stuff only, that's "Oatey" brand, clear, red label. Clean the edges well with Oatey cleaner. Also stick a small backing plate of PVC behind the rip.
I have used this stuff on antennas in the tropics and up north near the arctic circle. Good stuff. A2Jack.