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Unread 03-01-2008, 07:10 PM   #1
Dano382
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drywall ?

I installed all new drywall in the bathroom except the ceiling due to the blown in insulation. Now I'm mudding and taping. The cieling drywall has a oil base paint on it. how should I go about blending the new drywall with the old ceiling drywall that's painted? Don't want to have any issues later.

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Unread 03-01-2008, 07:12 PM   #2
ceramictec
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are you going to be tiling any areas ?
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Unread 03-01-2008, 07:21 PM   #3
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Shower area will be tiled to the ceiling. Kerdi will be used all the way to ceiling but, I'm concerned about the rest of bathroom.

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Unread 03-01-2008, 07:24 PM   #4
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paint

*Zinsser bullseye primer* on the oil paint ceiling first, then tape it, paint it, tile it.

hope that helps?
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Unread 03-01-2008, 07:30 PM   #5
Dano382
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Thanks Maack, wasn't sure if I would have any problems with the mud seperating from the moisture since it's in the bathroom.
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Unread 03-01-2008, 07:35 PM   #6
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Very good,

Your very welcome, Sir.

good luck!
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Unread 03-01-2008, 07:50 PM   #7
RevBubba
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Also be sure to lightly sand the existing oil-based paint before applying the primer - sand LIGHTLY, all you are trying to do is "dull" the paint film. This created "tooth" for the primer to stick to. This is a critical step when prepping oil-based finishes for recoating with modern acrylics in wet areas.

Zinsser 1-2-3 is a great "bridge" primer - in other words, a primer which can act as a bridge between the oil-based coating and the acrylic coating. I'd stick to the 1-2-3 (the interior/exterior blue-labelled can) instead of the "bullseye" version (interior only, has slightly lower-grade acrylic binders in it).

When it comes to covering an oil with an acrylic, you're much better off hedging your bets than taking your chances - if the new application fails, it can be much more costly to fix later.
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Unread 03-01-2008, 07:54 PM   #8
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So If I want to do a knock down texture on ceiling then just prime, texture, primer again and paint and all is good?

Ceiling is pretty flat looking due to all the paint layers over the years and needs to be re-textured to make it look new again.

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Unread 03-01-2008, 08:04 PM   #9
RevBubba
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OK, here's the process I'd follow, if this were my job to do:

1. very light sanding of the oil-based coating
2. prime with "bridge" primer
3. mudwork, finishing with a smooth skimcoat if necessary
4. mud must FULLY DRY before continuing
5. light sanding with 220 grit of mudwork, make it look very smooth, clean off the dust after!
6. apply texture
7. texture must be FULLY DRY before continuing
8. prime with high-quality acrylic primer
9. paint with Zinsser Perma-White, BM Aura, or any other paint formulated for use in wet areas. (These coatings will resist mold & mildew far better than an off-the-shelf cheapo paint!)

IMO you should not have to prime again after the mudwork and before applying the texture. The industry standard is to apply sprayed-on textures directly to raw drywall & mud, providing the dust has been wiped clean of the substrate before shooting the texture.
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Unread 03-01-2008, 08:27 PM   #10
Dano382
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Thanks RevBubba, sanding now and I have a can of the int/ext zinsser. I will prime ceiling, mud and tape, skim entire ceiling, sand smooth, clean and re-texture and then prime/ paint. Thanks so much......

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Unread 03-01-2008, 11:18 PM   #11
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personally I found a coat of primer before the texture worked well, especially for knockdown. By priming first you get a nice even surface to spray the compound on. The compound dries at an even, predictable rate which makes it much more conducive to getting a consistent texture.
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Unread 03-08-2008, 05:10 PM   #12
Dano382
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Need help decideing whether to texture walls and ceiling before I kerdi and tile, or to kerdi and tile then tape off and cover tile, and then texture. I can try to tape/cover areas of drywall that the kerdi is going on and texture first. Just don't know witch way is best.

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Unread 03-08-2008, 05:33 PM   #13
bbcamp
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Tile first, cover, the texture everything else. It'll be easier to remove the texture from the tiles than to remove the texture from where you want to tile.
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Unread 03-08-2008, 05:51 PM   #14
Dano382
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So prep walls to the point of being ready to texture, do kerdi, tile and grout, tape off tile work and come back and texture.
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