Go Back  DoItYourself.com Community Forums > Interior Improvement Center > Walls and Ceilings
Reload this Page >

It looks like my joint compound is bubbling up?

It looks like my joint compound is bubbling up?

Reply

  #1  
Old 04-03-17, 09:57 PM
A
Member
Thread Starter
Join Date: Dec 2016
Location: United States
Posts: 54
Received 0 Votes on 0 Posts
It looks like my joint compound is bubbling up?

Hi everyone - I was applying a second coat of mud to my new drywall tonight. Most if it went on just fine but there is one section that I cannnot get to be a nice flat texture. When I run the knife over it, right away it looks nice and smooth but then seconds later, it looks like it has these little bubbles in it - hopefully the picture helps but it's hard to see. What would cause this? How do I avoid it? And can a third coat fix it? Should I sand it when it's dry before a third coat? Thanks as always!

Name:  20170403_215218.jpg
Views: 218
Size:  8.2 KB
 
  #2  
Old 04-04-17, 04:19 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,964
Received 6 Votes on 6 Posts
It looks as if something oily was splattered on the wall prior to your mudding. If the mud is dry, try sanding it down with a sanding block to see if it either chips out or becomes smooth. If the former, then you may need to apply a primer before you add coats of mud to seal in whatever is causing the bubbles.
 
  #3  
Old 04-04-17, 04:40 AM
M
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 47,948
Received 384 Votes on 340 Posts
I'd probably take a drywall knife and use it to 'scrape' off the high spots before sanding. I agree if more than the high spots comes off there is a contaminant on the drywall that will need to be dealt with.
 
  #4  
Old 04-04-17, 05:01 AM
czizzi's Avatar
Member
Join Date: Jul 2007
Location: USA
Posts: 7,388
Received 15 Votes on 13 Posts
If using a pre-mixed compound, it has a little air in it. Work in in the pan before applying to the wall. When you do your final pull, the knife needs to be completely clean before each pass. I agree that you can run a knife over it before sanding and then fill in the bubble holes with a very thin coat.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: