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Shoutout to the guy at the lumberyard who told me to score the back of a drywall patch with a utility knife before mudding.
He said it helps the mud grip and stops the patch from showing a ghost line after painting, which I tried on a repair in a Phoenix condo last week and it worked perfectly.
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uma_martinez1d ago
Read that same tip in a forum last month.
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grantf7314h ago
Oh, I heard a painter on a local radio show talk about this. He said scoring gives the mud something to really lock onto, like tiny anchors, so it doesn't just sit on top. He claimed it helps stop cracks from coming back later, especially with bigger patches. Made sense when he explained it.
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grace_gonzalez461d ago
Scoring the back seems like extra work for no real payoff. A proper bed of mud behind the patch should do the same job if you apply enough pressure. Ghost lines are usually from bad sanding or thin paint, not the patch itself. That trick might just be fixing a different mistake you made.
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