Drywall – Fixing patch up that has gotten 1st coat of paint

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I tried to do my first diy patch job before painting and it did not turn out well. The first coat of paint was applied and I wanted to know how to fix it. Any guidance is appreciated and please keep in mind I’m a newbie.
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Best Answer

You need to sand and then re-coat it will be a bit tougher to sand with the paint on there but it will come off. To do a really good job sand just until you see the paper, wipe down with a wet cloth to remove the dust, then apply another coat of mud, I suggest a 12” wide knife or wider for best results you don’t want a thick coat. When put on two thick it shows more shrinkage so a quick sand and fill again may be needed, I shine a light on the work prior to painting , put the light close to the wall and look to see shadows on the other side of the patch. Lightly sand and recoat a wider patch will be less noticeable when you have a bump to hide, when I was a kid and learning it would take me 3,4,5 coats to get it good enough for my dad, today I usually get it in 2, sometimes 3 coats don’t rush it use light coats, And a light to show imperfections, they will be there the trick to hiding them is wider and uniform patch then a light spray texture can make it really look like a pro job.