Patching and Plastering - mud taping

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patchy
01-02-04, 09:13 AM
I am repairing a corner on the ceiling and we have taped and put mud compund on it. it has a crack o it already how do we prevent this from happening this is the second time it has appeared.

Dave_D1945
01-02-04, 12:05 PM
How thick is the mud? You may be trying to fill too much in one application. The mud shrinks when it dries and - if it's too thick - will crack. Another possibility is that the drywall isn't firmly attached and it's moving a little.
patchy
01-03-04, 07:55 AM
so I need to lay it on very thin and let it dry like layer it on? There are some pretty big gaps. will i have to take off the plaster that is already on there again and start over?

coops28
01-03-04, 09:24 AM
You need to fill in any gaps flush with the surface, let dry. Put your corner tape on with mud, let dry. put two thin coats over each side. Only enough to cover the tape. let dry and sand.
patchy
01-03-04, 05:20 PM
thanks for the info!!
Daystar
01-05-04, 06:57 AM
After assuring that drywall is firmly attached to framing, fill large gap with a setting-type joint compound(United States Gypsum's EZSand or Durabond). It sets up quicker than conventional joint-compound and allows you to apply subsequent coats sooner.
awesomedell
01-08-04, 08:02 AM
I'm with Daystar, always use 90 min ezsand for your pre-fill coat. You can fill a big hole faster & with less chance of future cracking in the seam.