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Posted by jstp on August 17, 2005, 4:37 pm
My friend has an 80 year old house with mostly plaster walls. In some
places, old paint and surface plaster has fallen off, leaving uneven patches
(maybe 1/16 of an inch deep and 1 square foot in size).
The problem is that, when using the pre-mixed light compounds, during
sanding some of his patches detach themselves from the substrate, even
though he has rough-sanded the surfaces before spackling.
Are there spackling coumpounds that have better adherence than others?
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Posted by Dumbo on August 17, 2005, 5:32 pm
jstp wrote:
> My friend has an 80 year old house with mostly plaster walls. In some
> places, old paint and surface plaster has fallen off, leaving uneven patches
> (maybe 1/16 of an inch deep and 1 square foot in size).
>
> The problem is that, when using the pre-mixed light compounds, during
> sanding some of his patches detach themselves from the substrate, even
> though he has rough-sanded the surfaces before spackling.
>
> Are there spackling coumpounds that have better adherence than others?
Don't know of compounds with more grip. Perhaps adding some glue might
help?
Rather than that, I would make each hole as deep as the plaster and
then patch away. Also, sanding before applying spackling leaves a
smooth surface with which the compound doesn't have a good bond.
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Posted by siralfred on August 17, 2005, 6:03 pm
The pre-mixed compound is not the best because it hardens through
evaporation. Some of that moisture will go back into the underlying
plaster and give a poor bond. If the dust from the rough sanding
wasn't thouroughly removed with a vaccuum that can also to contribute
to the problem. Mixing plaster of paris or a setting compound, such as
Durabond, is not as hard as it seems and will work much better than the
pre-mixed. Just follow the directions and safety precautions. This is
one time you really want to wear a dustmask, gloves and goggles. It's
more work, but you'll have a longer lasting patch.
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Posted by deans@wdeans.com on August 17, 2005, 6:13 pm
jstp wrote:
> My friend has an 80 year old house with mostly plaster walls. In some
> places, old paint and surface plaster has fallen off, leaving uneven patches
> (maybe 1/16 of an inch deep and 1 square foot in size).
>
> The problem is that, when using the pre-mixed light compounds, during
> sanding some of his patches detach themselves from the substrate, even
> though he has rough-sanded the surfaces before spackling.
>
> Are there spackling coumpounds that have better adherence than others?
Greetings,
Find a broken window-screen and replace it. Cut a portion of the old
window screen out. Coat the area you are patching with a light coat of
mud and then press the window screen into the wet mud. Use short
(3/4") drywall screws to firmly attach the taught window screen to the
wall. Don't skim on the screws; use a lot. Go back over the screen
with another layer of mud.
Hope this helps,
William
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Posted by EXT on August 17, 2005, 10:06 pm
Paint the area with latex primer and let it dry before filling with drywall
compound. It seals the surface, adheres loose dust and allows the compound
to stick.
> My friend has an 80 year old house with mostly plaster walls. In some
> places, old paint and surface plaster has fallen off, leaving uneven
patches
> (maybe 1/16 of an inch deep and 1 square foot in size).
>
> The problem is that, when using the pre-mixed light compounds, during
> sanding some of his patches detach themselves from the substrate, even
> though he has rough-sanded the surfaces before spackling.
>
> Are there spackling coumpounds that have better adherence than others?
>
>
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