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Those types are a bitch. You're right to wonder how the board was fixed, in my experience it needs to have something solid bridging the join on the back side of the plasterboard to even have a chance of not cracking.
Since you don't want to have to remove it to find out I'd say the best way to try and fix it is with Toupret fine scrim tape and toupret fibacryl. Dig out the crack a to a v shape and apply fibacryl then scrim tape a bit more fibacryl and then feather it out with tx110.
Or scrub all that and line the wall, I would do that if I had to guarantee it didn't come back.
Airhead
Hovis
I've got this half arsed wall finished half arsed wall repair that I need to get sorted. It's a plasterboard wall that got caved in during a party. I don't know how the repair was done, but I'm guessing a square piece of plasterboard was spliced in to replaced the dented part. Problem is there is a hairline crack all the way around where this join was done, so a big square essentially. I don't know if a backing board was put in at the joint, or if scrim tape was used.
I'm tempted to sand it flat and get it painted up and hope the crack goes away? Can anyone advise what I should do? I really don't fancy taking out the panel and redoing it.