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Old 09-17-2008, 09:43 PM   #1
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First coat on inside corner, need advise..


Hi everyone,
I finished taping my basement, and I am giving the inside corners their first coat. As much as I try, some compound gets on the opposite side of the inside corner. If I try to pass the knife to clean it up, I end up messing up the other side. Do I wait till it dries, then scrape it with the knife before I give it a coat?

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Old 09-17-2008, 09:49 PM   #2
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First coat on inside corner, need advise..


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Originally Posted by helpless handyman View Post
Hi everyone,
....Do I wait till it dries, then scrape it with the knife before I give it a coat?
There is a way to wipe the excess off without ruining the inside corner, but it really does take a long time to be able to learn and do.

My suggestion for a newbi, is to let it dry, and scrape the excess off.

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Old 09-17-2008, 10:07 PM   #3
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First coat on inside corner, need advise..


Thanks Atlantic, always to the rescue! Can I ask how it's done not to ruin the other side? Also, are those inside knives any good?
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Old 09-17-2008, 10:27 PM   #4
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First coat on inside corner, need advise..


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Originally Posted by helpless handyman View Post
Thanks Atlantic, always to the rescue! Can I ask how it's done not to ruin the other side? Also, are those inside knives any good?
1. patience and practice

2. corner knife can be good idea, less patience required but still a little practice is needed.
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Old 09-18-2008, 06:59 AM   #5
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First coat on inside corner, need advise..


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....Can I ask how it's done not to ruin the other side?
It's a little tought to describe over the internet.
First off, the knife is always held with your thumb on one side, and your index finger on the other side of the blade. That allows you to control, and apply pressure as needed, per side. Good coating is about getting a "feel" for the knife, the angle it is held at, and the amount of pressure you apply over each area of the blade.

To wipe excess compound off one side of a corner, the blade is held almost flat against the clean side of the corner. It is also held so that the blade is slightly turned (not quite perpendicular to the vertical corner), in such a way, that if the knife's edge were to "touch" the opposite corner, only the very point of the knife would contact it, leaving a very slight line on the very inside of the wet corner.

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Originally Posted by helpless handyman View Post
....
Also, are those inside knives any good?
Haven't attempted to use one of those since I was first learning how to coat. I will say, the key with those is not leaving too much compound on the walls.

I once had a pretty experienced drywall worker, who insisted on using that tool, BUT, he would not wipe off enough compound with that corner tool. Stubborn little bugger. He took alot of pride in his work, but that one point, he just refused to listen to me about.

The result was that he would end up leaving about 1/8", or more, of compound on the inside edge of the corners. This would totally screw up the 90 degree angle, and drive us crazy when we went to install the baseboard or chair rails.
Last time I used him: I had repeatedly told him NOT to use that tool. I went around and showed him the 90 degree corners with a speed square, before he started a small job, and told him that I wanted the corners to be that same 90 degrees when he was done. I even taped and coated two corners on my own, using a 6" knife, to show him that it is possible to keep the 90 degree, even after coating.
Of course, he was too stubborn. He went back to using that corner tool, and screwed up every corner. When I went to him about this, he argued with me, until I took out the speed square and should him all his corners, and went back to the two I did. Finally...silence!!.....Nothing to say... A first!
That was his last job for us, sent him home for good.

My point: Be careful of those corner tools when coating drywall. They are primarily for plastering, which is a thicker veneer coating. If you look at the shape of the corner tool, you will see how it is contoured to apply more material on the inside of the corners (plaster).

Applying Drywall compound in corners is smoother, with less application of product, in order to keep that corner at a 90 degree measurement. This is important at many levels, including cabinetry, baseboard, chair-rails, crown molding, etc.
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Last edited by AtlanticWBConst.; 09-18-2008 at 07:07 AM.
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Old 09-18-2008, 09:18 AM   #6
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First coat on inside corner, need advise..


Thanks bigBob. Thanks AtlanticWest, for your quick responds(like always) and for taking your time to explain this to me. I know one cannot learn this overnight, but I will definately try your method. I always saw those corner knives and always assumed it would leave to much mud on the inside corner. Glad I didn't buy one. I will practice on the closet, I am pretty good taping and skin coating the seams and butt joints. It's only the inside corners I have to get good at. I am a very picky person, and always like my work to look good, by the way I am living here and will be looking at the finish product for years to come, lol.
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Old 09-24-2008, 01:22 PM   #7
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First coat on inside corner, need advise..


I still find the corner knife useful to set the tape in the corner. I then hit both sides with a 6" knife to remove the excess mud. For subsequent coats I use a straight knife and do one side, let it dry, then do the other side. Note this coming from just a DIY'er, not a pro (obviously)

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