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plaster repair - holes from pulling wire

Posted by homebound (My Page) on
Tue, Oct 12, 10 at 16:36

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


Follow-Up Postings:

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RE: plaster repair - holes from pulling wire

Just brush the loose plaster away.


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RE: plaster repair - holes from pulling wire

Thanks.


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RE: plaster repair - holes from pulling wire

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.


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RE: plaster repair - holes from pulling wire

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.


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RE: plaster repair - holes from pulling wire

"...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.


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