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the pics dont really show just how much differencve in depth there is from the metal and the old paint/drywall. It really is quite deep. Also when I press on certain areas of the metal strip it does not seem to be attached to the backing. I'm guessing this is what caused it to bubble up and come apart in the first place.
I am going to try carefully inserting some joint compund behind the metal strips with a butter knife or something and making sure it's solid before doing anything else.
Im really just worried about filling in this deep pit with compound only to have it crack again in the near future.
also I should mention that I did not cut out the entire corner from ceiling to floor. There are parts in the middle that seem quite solid. When I press on it, there is no popping sound or any give. So I thought I would leave those sections and only repair what is needed.
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