Probably already been answered but you can NOT use Lok-tite on plastic! It disentegrates the plastic exactly as you have described. It is ONLY for metal-to-metal surfaces and, if there is plastic sandwiched between, I don't recommend it. Instead, look on Amazon for "Threadlocker for Plastic." It will accomplish the same goal of locking your threads without ruining the plastic components.
Your shell is likely ruined & will need to be replaced. If its ONLY the lower shell you may be able to avoid reshelling by picking up a set of UAV-bits' Phantom Reinforcement Plates. If you have even the slightest doubt that the Lok-tite came in contact with the upper shell then I would just reshell to be safe. Another alternative to reshelling would be the UAV-bit reinforcement plates coupled with taping the shell seams. You could use white or clear tape to reduce the appearance factor.