plaster repair - holes from pulling wire

homeboundOctober 12, 2010

An electrician pulled some wire, so now we need to repair the rectangular access holes in the plaster walls. If I use drywall + easysand, do I need to wet the edges of the existing plaster before filling the gaps with easysand? Thanks.

BTW, this is an excellent earlier thread on plaster repair:

http://ths.gardenweb.com/forums/load/repair/msg1018465615528.html

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macv

Just brush the loose plaster away.

    Bookmark   October 12, 2010 at 4:49PM
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homebound

Thanks.

    Bookmark   October 13, 2010 at 10:10AM
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brickeyee

If you do not dampen the edges of the old plaster it can easily pull the moisture from setting material so that it does not harden properly and forms a poor bond to the old plaster.

I even use Eucoweld bonding agent if I have some, or white Elmer's glue to bond the edges.

Cut the Elmer's about 50% with water and paint it on, then wait for it to get tacky before pressing the patching material onto the plaster edges.

    Bookmark   October 13, 2010 at 2:49PM
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macv

As with a concrete mix, it is necessary to add more water to a plaster mix than is necessary for complete hydration in order for the mix to be workable so some loss of water from the mix to porous materials should not prevent complete hardening of the patching plaster.

However, spraying with water would probably not cause a problem if you give it a chance to be absorbed.

    Bookmark   October 14, 2010 at 9:34AM
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brickeyee

"...some loss of water from the mix to porous materials should not prevent complete hardening of the patching plaster."

It can and does weaken the plaster, especially the bond betweenthe new ond old paster.

Plaster and setting drywall compounds are mixed for handling and working.

Just like it does with new concrete placed against old concrete.

    Bookmark   October 14, 2010 at 5:33PM
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