On Tuesday, December 31, 2019 at 8:14:06 PM UTC-5, Lynn S wrote:
replying to Ronald Long, Lynn S wrote:
That sounds interesting. I have an area where I used ultralight drywall
joining up to regular gypsum and a crack always develop there. That might
work. Also Home depot has a tape that they say will stop cracks when used with
elastoflex by Dap. I have tried the mesh and it makes it crack more.

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HD also has a spray product, some kind of elastic product that's for
cracks. I bought a can of it years ago, but never used it. It also
depends on how much movement there is, how big the crack forms, etc.
If it's just typical hairline crack from temp expansion/contraction, etc.
you may succeed with that. If it's an 1/8" gap do to settling and
continued movement, good luck.