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Drywall....The morning after...discolored areas in newly dried mud

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Drywall....The morning after...discolored areas in newly dried mud stevegeneral 07-25-2008
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Posted by stevegeneral on July 25, 2008, 3:42 pm


HOW COME WHEN I....
Had a loose panel with some cracks...
Fixed it with new drywall screws or mesh tape...
Washed it with mild detergent...
Wiped it with clean wet rag...
Let it dry...
Then applied two coats of brand new mud from a brand new bucket over three
days (low 70s, 50% RH)....


SO WHY....When the mud dried there were small (Less than 1/4") discolored
areas (greenish) with tiny cracks in the middle of each little blob? I'm
thinking there must be some kind of a chemical reaction happening that is
making the mud shrink. Any ideas? These are not tool marks, and they are
not air bubbles. ( Believe me, as a newbie, I've seen plenty of both)
These are different.

Thanks for any suggestions


steve
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Posted by mucker111 on July 25, 2008, 4:07 pm


On Jul 25, 3:42 pm, stevegeneral999_at_yahoo_dot_...@foo.com
(stevegeneral) wrote:
> HOW COME WHEN I....
> Had a loose panel with some cracks...
> Fixed it with new drywall screws or mesh tape...
> Washed it with mild detergent...
> Wiped it with clean wet rag...
> Let it dry...
> Then applied two coats of brand new mud from a brand new bucket over three
> days (low 70s, 50% RH)....
>
> SO WHY....When the mud dried there were small (Less than 1/4") discolored
> areas (greenish) with tiny cracks in the middle of each little blob? I'm
> thinking there must be some kind of a chemical reaction happening that is
> making the mud shrink. Any ideas? These are not tool marks, and they are
> not air bubbles. ( Believe me, as a newbie, I've seen plenty of both)
> These are different.
>
> Thanks for any suggestions
>
> steve
> -------------------------------------
>
> ##-----------------------------------------------##
> Delivered via http://www.thestuccocompany.com/
> Building Construction and Maintenance Forum
> Web and RSS access to your favorite newsgroup -
> alt.home.repair - 303330 messages and counting!
> ##-----------------------------------------------##

How much mud did you have to use?
Was it a big hole?

Posted by Phisherman on July 26, 2008, 8:45 pm


On Fri, 25 Jul 2008 13:07:16 -0700 (PDT), mucker111

>On Jul 25, 3:42 pm, stevegeneral999_at_yahoo_dot_...@foo.com
>(stevegeneral) wrote:
>> HOW COME WHEN I....
>> Had a loose panel with some cracks...
>> Fixed it with new drywall screws or mesh tape...
>> Washed it with mild detergent...
>> Wiped it with clean wet rag...
>> Let it dry...
>> Then applied two coats of brand new mud from a brand new bucket over three
>> days (low 70s, 50% RH)....
>>
>> SO WHY....When the mud dried there were small (Less than 1/4") discolored
>> areas (greenish) with tiny cracks in the middle of each little blob? I'm
>> thinking there must be some kind of a chemical reaction happening that is
>> making the mud shrink. Any ideas? These are not tool marks, and they are
>> not air bubbles. ( Believe me, as a newbie, I've seen plenty of both)
>> These are different.
>>
>> Thanks for any suggestions
>>
>> steve
>> -------------------------------------
>>
>> ##-----------------------------------------------##
>> Delivered via http://www.thestuccocompany.com/
>> Building Construction and Maintenance Forum
>> Web and RSS access to your favorite newsgroup -
>> alt.home.repair - 303330 messages and counting!
>> ##-----------------------------------------------##
>
>How much mud did you have to use?
>Was it a big hole?

LOL!!!!!!!!!!!!!!!!!!!

Posted by Phisherman on July 26, 2008, 8:43 pm


On Fri, 25 Jul 2008 19:42:04 GMT,
stevegeneral999_at_yahoo_dot_com@foo.com (stevegeneral) wrote:

>HOW COME WHEN I....
>Had a loose panel with some cracks...
>Fixed it with new drywall screws or mesh tape...
>Washed it with mild detergent...
>Wiped it with clean wet rag...
>Let it dry...
>Then applied two coats of brand new mud from a brand new bucket over three
>days (low 70s, 50% RH)....
>
>
>SO WHY....When the mud dried there were small (Less than 1/4") discolored
>areas (greenish) with tiny cracks in the middle of each little blob? I'm
>thinking there must be some kind of a chemical reaction happening that is
>making the mud shrink. Any ideas? These are not tool marks, and they are
>not air bubbles. ( Believe me, as a newbie, I've seen plenty of both)
>These are different.
>
>Thanks for any suggestions
>
>
>steve
>-------------------------------------
>
>
>
>
>##-----------------------------------------------##
>Delivered via http://www.thestuccocompany.com/
>Building Construction and Maintenance Forum
>Web and RSS access to your favorite newsgroup -
>alt.home.repair - 303330 messages and counting!
>##-----------------------------------------------##


Mud shrinks as it cures and it may crack especially in areas where the
mud is applied too thick. The drying process will pull any dyes or
ink in paper. A good mud job takes a few thin layers progressing
from a 4", 6", and 10" knives, waiting a day between coats if you can.
You can pre-spot the greenish areas with some PVA or shellac to help
stop the color transfer. Mud drying is a physical reaction.

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