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Obtuse Inside Corners

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Old 07-05-2019, 01:34 PM   #1
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Obtuse Inside Corners

I'm sure this question has probably been discussed too many times, but...I've been dealing with a lot of these shallow ceiling angles and I'm doing an awful job making them look okay.

I taped a few with paper tape and I'm trying to round them off so the crooked line isn't as noticeable. The worst are where my level/flat drop ceiling framing meets the underside of bowed/sagging roof rafters. I saw a rubber drywall knife online but I just ran a 12" perpendicular to round it off. Sanding that radius was very awkward.

It will eventually end up "passable" but what should I do next time so I don't waste countless hours touching up?

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Old 07-05-2019, 02:02 PM   #2
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Re: Obtuse Inside Corners

Hire a drywall finisher has always been my go to.


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Old 07-05-2019, 02:28 PM   #3
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Re: Obtuse Inside Corners

Check out No Coat Ultraflex
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Old 07-05-2019, 04:33 PM   #4
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Re: Obtuse Inside Corners

I have a friend who grinds the desired curve into the edge of a 6" knife.
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Old 07-05-2019, 05:52 PM   #5
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Re: Obtuse Inside Corners

I use straight flex they make a rubber knife for curved/scooped look. It's like a spatula.

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Old 07-05-2019, 06:33 PM   #6
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Re: Obtuse Inside Corners

A bat knife will be your friend! Also no-coat ultraflex is a good option.

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Old 07-07-2019, 05:13 PM   #7
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Re: Obtuse Inside Corners

We used to use a 5" rubber sanding disk (the flexible kind) before they came out with one's with handles. It was known as a rubber ducky in the field.

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Old 09-03-2019, 11:17 AM   #8
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Re: Obtuse Inside Corners

Wet masonry sponge for a silky smooth finish.
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Old 09-04-2019, 04:26 PM   #9
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Re: Obtuse Inside Corners

Sponges are a last resort. They tend to make scuffs and scratches, at a minimum.

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