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-   -   Corner Knives - Good? Bad? (http://www.diychatroom.com/f101/corner-knives-good-bad-118467/)

Oh-Fudge 09-27-2011 01:07 PM

Corner Knives - Good? Bad?
 
Just wanted to get an opinion from the pros, do "real" drywallers use the corner knives or do you do corners with a straight 6" knife?

I am a homeowner who might do drywall once every few years when I get a bug to remodel something. Never could get the hang of taping and mudding and hate it with a passion. I admire the pros who can get a smooth finish without even sanding. Thanks!

Rehabber 09-27-2011 07:46 PM

I am not a drywall pro, but I do drywall/repairs on a regular basis. I use a corner tool for corners. It makes it a lot easier for me.

OhioHomeDoctor 09-27-2011 07:58 PM

Corner trowels are for amateurs who do not care about quality. Honestly its easier to just do it right. Use a four inch knife and paper tape. Apply even coat of mud to each side of the corner. Be sure to fill the gaps, then fold paper tape down the crease and push into the corner. Use your knife to pull excess mud out of each side, one at a time. Once the tape drys coat one side of the corner at a time until its ready for sanding. After your first corner you will be a better drywaller than a guy who uses a corner trowel for a lifetime.

1910NE 09-27-2011 11:28 PM

Also not a pro...I use a corner knife to get the mud up on the wall and evenly applied. Then a 4 inch knife to press the tape in/ push the excess mud out. After that its all straight knives..

chrisBC 09-28-2011 12:49 AM

I am not a pro drywaller, however I do a fair bit of small boarding jobs and repairs.

I used to use a corner trowell for all my corners, then one day tried my taping knife. Found it much easier and smoother than the corner trowell, now I just use my taping knife for everything.

Snav 09-28-2011 08:10 AM

I'm with Chris: I use a 7" taping knife - I prefer it. I use the plastic ones, too - because they have a rounded corner on them and don't tear the paper. Metal knives have a sharp 90-corner and gouge and shred paper, I hate that.

If my house was a bit more square and plumb I'd use metal corner beads with a paper strip and just tack them up with a roller like the pros do. I do use these on outside corners, though - love them - and a taping knife works fine here, too.

I hate plastic bead strips - it takes extra mud to cover them over.

DangerMouse 09-28-2011 08:22 AM

I have a corner trowel I got in a box of misc. tools at auction.
It's out in the shed..... somewhere.... probably still in that box..... it never came in the house at all during my drywalling stage. In the time it would have taken me to find it, I had already done the corners...... :laughing:

DM

DrHicks 09-28-2011 10:19 AM

Quote:

Originally Posted by Rehabber (Post 737205)
I am not a drywall pro, but I do drywall/repairs on a regular basis. I use a corner tool for corners. It makes it a lot easier for me.

Ditto here.

DrHicks 09-28-2011 10:20 AM

Quote:

Originally Posted by OhioHomeDoctor (Post 737221)
Corner trowels are for amateurs who do not care about quality. Honestly its easier to just do it right. Use a four inch knife and paper tape. Apply even coat of mud to each side of the corner. Be sure to fill the gaps, then fold paper tape down the crease and push into the corner. Use your knife to pull excess mud out of each side, one at a time. Once the tape drys coat one side of the corner at a time until its ready for sanding. After your first corner you will be a better drywaller than a guy who uses a corner trowel for a lifetime.

That's pretty presumptuous. :whistling2:

DrHicks 09-28-2011 10:22 AM

Quote:

Originally Posted by OhioHomeDoctor (Post 737221)
Corner trowels are for amateurs who do not care about quality. Honestly its easier to just do it right. Use a four inch knife and paper tape. Apply even coat of mud to each side of the corner. Be sure to fill the gaps, then fold paper tape down the crease and push into the corner. Use your knife to pull excess mud out of each side, one at a time. Once the tape drys coat one side of the corner at a time until its ready for sanding. After your first corner you will be a better drywaller than a guy who uses a corner trowel for a lifetime.

That's pretty presumptuous. :whistling2:

Marbledust 09-28-2011 10:27 AM

regular knife to apply first coat of mud...corner tool to apply next 2 layers...saves time and comes out straight and smooth

jburchill 09-28-2011 12:28 PM

Everyone is different and its a matter of choice and preference as long at the end results come out good.

I've used them on corners before to set the tape quicker then used a knife to apply pressure to squeeze the excess mud out. Then mud again with a knife.

AGWhitehouse 09-28-2011 12:56 PM

Quote:

Originally Posted by Marbledust (Post 737508)
regular knife to apply first coat of mud...corner tool to apply next 2 layers...saves time and comes out straight and smooth

My approach is the exact opposite, haha. I use the corner trowel to lay in the mud for the first coat. It gives me that nice straight line without fuss. Then I straight blade subsequent coats. I found the corner blade cumbersome after the first coat because the mud width becomes larger than the corner trowel to accommodate blending so you'll end up using the straight blade anyways.

Oh-Fudge 09-28-2011 02:00 PM

Wow, seems to be a variety of opinions. This last project I used a straight knife for the corners and have to admit it looks better than using the corner knife. BUT, and a big but, doing one side at a time and waiting for each to dry before doing the other side, after 3 coats, is a royal PIA and waste of valuable time. I am taping the inside of a new 2'x3' closet and the close quarters make it hard to use the corner tool.

I can't believe in this day and age someone hasn't invented a better way to hang drywall. How about drywall tongue-and-groove? Or drywall caulk crack filler? Or roll-on seemless drywall (like rain gutters)?

Snav 09-28-2011 03:01 PM

Well I think it strongly depends on your overall approach to taping and your wall-surface/end look.

I texture my walls - so I've found that having a perfectly squared corner works against my efforts to do a skip texture.

If I was doing idyllic smooth walls any imperfection in a bead would work against me - I'd use other tools.


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