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How deep to groove cracks before refilling with compound?

How deep to groove cracks before refilling with compound?

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  #1  
Old 08-06-15, 12:11 PM
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How deep to groove cracks before refilling with compound?

I have tons of hairline and some slightly bigger cracks all over the ceiling and walls after many years. The plan to repair is making those cracks bigger and then refilling with Durabond easy sand compound.

The problme is that I am not sure how deep and wide the proper size to etch out those cracks so that the compound has best chance to stick to it. I know bigger is better but not sure if making too big will eventually be worse.

Here are soem examples of be making different size etches (From just gong over it with a kniife to a 3 inch bend scrapper)...


1 - 2015-08-06_1506 - directories's library
2 - 2015-08-06_1506 - directories's library
3 - 2015-08-06_1506 - directories's library
4 - 2015-08-06_1507 - directories's library
5 - 2015-08-06_1508 - directories's library
6 - 2015-08-06_1510 - directories's library
7 - 2015-08-06_1510 - directories's library
8 - 2015-08-06_1511 - directories's library

Any of those look like the correct/best way to do it?

Thanks!
 
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  #2  
Old 08-06-15, 02:19 PM
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I've never paid a lot of attention to how wide/deep I scratch out plaster before filling it with durabond but pic #2 looks about right.
 
  #3  
Old 08-06-15, 03:49 PM
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Cool. Do you put any tape (FibaFuse or Paper) on that or Dubabond works fine itself?
 
  #4  
Old 08-07-15, 03:20 AM
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I often don't use tape when repairing plaster with Durabond although if a crack has me leery I will. You must use tape if you use regular joint compound!
 
  #5  
Old 08-07-15, 10:42 AM
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I just realized that durabond 90 cant be sanded so not sure how that can be used to to repair/fill tiny cracks since it will almost always be the top coat when evening it with the rest of wall. No matter how perfect you put it on, there is always some sanding that needs to be done before painting and such.

Is it really that unsandbale or are they just talking to people who may want to try to sand half an inch of something?

Do you use Durabond and then Sheetrock Easy Sand 90 to cover it or there is some sandability in Durabond?
 
  #6  
Old 08-07-15, 11:39 AM
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Durabond is sandable but it doesn't sand easy. The neater you apply it, the less sanding is needed If I expect to sand a good bit, I'll apply regular j/c for the final coat.
 
  #7  
Old 08-07-15, 12:32 PM
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Thanks! All i wanted to know. Definitely going with Durabond.
 
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