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Old 04-20-2012, 07:45 AM   #1
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Struggling with Outside Corners


I'm working with 2 sides of a outside corner. One side is new drywall - the other is old existing wall with previous cornerbead being metal.

I decided to remove the corner bead, which on the old wall, still left like 1/32 thickness of mud on the old wall.

Ran No-Coat on it . In trying to keep the corner tight with as minimal taper to the edge possible, it's been a helluva bear trying to finish off the corner to match the exisiting mud so that the edge has square mud edge. I think I'm on my 4th coat already...

I've worked tons with No Coat on new wall and I love the edge it gives.
Just having a bear with working with old/new/matching mud taper/knifing mud to the edge.

Fast forward. I think it's my technique on pulling the knife.
I'm going to try to give it 2 successive thin coats, but instead of pulling the knife vertical, mud the very corneredge and pull the knife from inside of the wall towards the edge. I won't even wipe the edge sharp on the opposing wall ( as it tends to drag mud from the other side). Let it dry and just sand the overhang out, which should be me that sharp edge.

Grrr. It my be faster just to rip the old walls out and then start with fresh ;-). That's the same thing when I had to undercut sheetrock...


Last edited by mobiledynamics; 04-20-2012 at 07:57 AM.
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Old 04-20-2012, 07:57 AM   #2
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Struggling with Outside Corners


Not wild about them but you might try an outside corner tool? It will do both edges at once. Or so the rumor goes.




Last edited by user1007; 04-20-2012 at 08:00 AM. Reason: Added Pictures
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Old 04-20-2012, 09:05 AM   #3
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Struggling with Outside Corners


what type and size of knife are you using? was the corner bead put on correctly so you have space to load the corner?
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Old 04-20-2012, 09:15 AM   #4
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Struggling with Outside Corners


8" Knife....the new drywall side is fine.

I ended up actually removing 1/4" of paper on the side that went onto the old sheetrock. The issue is the previous mud buildup and then tapering to the edge.

When tape was laid, there was even a *recess* between the paper and the old buildup (old mud has more mud to taper due to metalbead)..

I'm just fighting to get a sharp edge with thin coats and trying to stay away from laying a heavy mud coat to sand it down...
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Old 04-20-2012, 08:17 PM   #5
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Struggling with Outside Corners


What I have done when I have been in this situation is first fill the recess from the old bead with your hot mud of choice then install then new no coat or paperfaced bead over it . I know this doesnt help you now but i fought it the first time I did it also, this is how we learn.
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