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Posted by gdevinney on July 29, 2006, 11:27 am
In a 90 Year old house, plaster walls have spider cracks. They seem to
not be
into the plaster, but may be just cracked layers of paint. I
see a shiny surface
in the cracks, so I wonder if it's cracked paint
on top of an old glossy oil
pain w/o proper prep.
We primed & painted, but the cracks reappear immediately.
A
contractor skim coated a room & painte, they came back. Not sure
what he used.
I don't want to put in the time and effort of using mesh solutions,
and
definately don't want to tear out the plaster.
Is hanging wallpaper the best
and easiest solution, or can some paint
or easy roll on type product cover this?
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Posted by m Ransley on July 29, 2006, 12:11 pm
It is old bad paint but I had good luck many times with 2-3 coats of
thick paint keeping the cracks away for 5 years, Go to a paint store and
get a top line latex, you can even leave the top off the cans for a few
days to evaporate water and make it thicker. You could even try an
exterior product for the first coat it should be more flexible when dry,
roll it on as thick as you can.
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Posted by Norminn on July 29, 2006, 10:34 pm
gdevinney wrote:
> In a 90 Year old house, plaster walls have spider cracks. They seem to
> not be into the plaster, but may be just cracked layers of paint. I
> see a shiny surface in the cracks, so I wonder if it's cracked paint
> on top of an old glossy oil pain w/o proper prep.
>
> We primed & painted, but the cracks reappear immediately. A
> contractor skim coated a room & painte, they came back. Not sure
> what he used.
>
> I don't want to put in the time and effort of using mesh solutions,
> and definately don't want to tear out the plaster.
>
> Is hanging wallpaper the best and easiest solution, or can some paint
> or easy roll on type product cover this?
>
If the paint isn't peeling or blistered, you can fill fine cracks with
paintable caulk. It is normally used for corner cracks, which most
rooms eventally get. You can smoosh it on with finger and wipe smoothe
with damp rag. If cracks are numerous, try applying with wide spackle
blade. A little flexibility will probably keep cracks from coming
through as quickly, at least, and won't do any harm. Be sure it is
paintable!!
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Posted by on July 30, 2006, 2:25 am
no@spam.invalid (gdevinney) wrote:
>In a 90 Year old house, plaster walls have spider cracks. They seem to
>not be into the plaster, but may be just cracked layers of paint. I
>see a shiny surface in the cracks, so I wonder if it's cracked paint
>on top of an old glossy oil pain w/o proper prep.
Probably.
>We primed & painted, but the cracks reappear immediately. A
>contractor skim coated a room & painte, they came back. Not sure
>what he used.
Try using shellac to prime the walls, let it dry (cure) thoroughly (at
least a week), cover with jointing compound to fill in the cracks,
shellac again (cure) and then paint normally. You can skip the
jointing compound and second shellac coat if the wall is smooth
already. The shellac forms a hard surface which "floats" over the
shifting substrate.
>I don't want to put in the time and effort of using mesh solutions,
>and definately don't want to tear out the plaster.
>Is hanging wallpaper the best and easiest solution, or can some paint
>or easy roll on type product cover this?
You could also use a liner paper to cover the crazed surface and then
paint over that.
Or, depending on how good you want the finish, you could cover the
wall with fiberglass mesh and then skim coat the entire thing with
jointing compound. I know you don't want to do this but it's really
not that hard and it will give you the best finish.
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Posted by Tim Mulvey on July 30, 2006, 10:54 am
> In a 90 Year old house, plaster walls have spider cracks. They seem to
> not be into the plaster, but may be just cracked layers of paint. I
> see a shiny surface in the cracks, so I wonder if it's cracked paint
> on top of an old glossy oil pain w/o proper prep.
>
> We primed & painted, but the cracks reappear immediately. A
> contractor skim coated a room & painte, they came back. Not sure
> what he used.
>
> I don't want to put in the time and effort of using mesh solutions,
> and definately don't want to tear out the plaster.
>
> Is hanging wallpaper the best and easiest solution, or can some paint
> or easy roll on type product cover this?
>
You might want to try a product from USG called Tuff-Hide. It's a
primer/surfacer that's pretty awesome. We repaired cracking and crumbling
plaster throughout a church, then used it as a primer. The roofer had
trouble flashing some roof to wall areas and there were some pretty good
leaks. The worst spot looked like a balloon on the ceiling. The Tuff-Hide
didn't leak or crack, but instead held almost a gallon of water. I bet it
would work wonders for your application.
Tim
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