Mud repairs shiny, smooth and hard.

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Old 08-12-19, 05:53 PM
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Mud repairs shiny, smooth and hard.

I was leveling a wavy wall going up a staircase in my home using premixed general purpose mud. Took many passes and coats but I got it pretty good. I thinned the mud a bit with some water for a final top coat. After sanding I had some small areas that needed touch-ups. What I noticed is that with the spot repairs they looked shiny and very smooth and they were very hard to sand keeping them a bit raised with normal sanding. They even had a deeper gray colour to them. Any one know what happened here? I'm going to go after the spots more aggressively to get them flat but I would like to know what happened to cause the mud to dry so funny. Thanks
 
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Old 08-12-19, 06:12 PM
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What was on the wall before you skimmed it? Was it painted before or was it bare drywall?
 
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Old 08-12-19, 06:39 PM
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Is the original wall drywall or plaster?
 
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Old 08-13-19, 01:55 AM
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using premixed general purpose mud
First question, what material was used?
 
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Old 08-13-19, 03:56 AM
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Normally when joint compound is grey it's because it hasn't completely dried yet. How thick did you apply the j/c? Usually touch up spots are applied thin and barely need sanding.
 
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Old 08-13-19, 03:05 PM
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The wall was painted but the repairs in question were over areas that had mud on them.
 
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Old 08-13-19, 03:08 PM
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Tighcoat, the original wall is drywall and it was painted.
 
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Old 08-13-19, 03:13 PM
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Marq1, I used the bucket of mud found at local home depot: CGC Dust Control
 
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Old 08-13-19, 03:29 PM
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I have found that setting type drywall compound tends to be a darker gray then premixed mud out of a bucket, but you have to mix setting type.

I suspect the darker color is paint coming through the mud. Painted walls are quite difficult to sand through.
 
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