Taping and floating question


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Old 01-02-14, 01:50 PM
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Taping and floating question

So my drywall is up and i've done the whole joint compound - tape - joint compound procedure. I've sanded it down but what i've see is... what looks like... air bubbles that formed inside of the joint compound presanding but after sanding have left little grooves or thin lines.

So here's my question. Do i go over those spots again with joint compound or just paint over them with primer?

here is an image of what i'm talking about. There are not a whole lot of them, but there are enough to make me post this question
 
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Old 01-02-14, 02:01 PM
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Are these bubbles where the tape is? You'll need to cut out the bubbles and remud those areas.
 
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Old 01-02-14, 02:13 PM
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Paint will not hide any imperfections in the mud. You say you've done the whole procedure... but if it's not perfect you still need to give it another skim coat. That's a final thin coat that fills in things like that.

The skim coat will usually be your third or fourth coat of joint compound.
 
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Old 01-02-14, 02:36 PM
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If you do not wipe away the sanding dust, it gets caught in the pits and valleys of the previous coat and does not stick. Wipe good with a broom before application of next coat. Inspect holes like this and blow air into them to clean. Mix the mud in your pan before applying to the wall to minimize air pockets from the manufacturing process.
 
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Old 01-02-14, 02:44 PM
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Keep in mind that paint usually amplifies defects in the wall rather than hiding them.

You're not ready for primer yet, unfortunately.
 
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Old 01-02-14, 03:30 PM
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more than 1 coat... didn't know that! that makes so much sense now. thanks a bunch!
 
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Old 01-03-14, 03:47 AM
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3 coats of mud is standard. Personally, I'd rather apply an extra coat of mud than do any extra [extensive] sanding. Normally only the final coat gets sanded but you'll need to either scrape or sand off those bumps before applying more mud. As noted above, any sanding dust needs to be removed before applying another coat of mud or the primer. When you apply the primer, look closely at the drywall finish, if you see any defects go back later and remud/sand and prime them - paint will not make defects in the drywall finish go away.
 
 

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