Lesson learnt, thread lock eats petg (and moat other plastic after doing some searching) it's all very soft and crumbly wherever the thread lock has touched. : r/3Dprinting
Henkel Loctite 2400 Medium Strength Threadlocker and Sealant — VehicleClips
LOCTITE THREADLOCKER 222
222, 50ML Loctite, Adhesive, Threadlock, Threadlocking | Farnell UK
Genuine Loctite 272 High Temperature/Strength Threadlocker, 250 mL Bottle, Red 6767152351131 | eBay
PSA - Avoid getting Loctite Thread Locker near your ABS prints! : r/3Dprinting
Loctite 1918245 270 High Strength Studlock 10ml | Rapid Online