[Cob]plasters

[Patrick Newberry]

rather than an actual plaster, I find a lime wash works fine for cob. What I do is make a white wash mix with lime, basicallyI use hydrated lime and water. I lightly spray the cob wall with water to get it damp, then with a big old paint brush, brush on the lime wash. The first coat mixed in and bonds with the cob. I add two more coats and it's nice and white. No heavy mixing, a single 5 gallon container is what I mix it up in and it goes on quite fast. 

Pat 



-----Original Message-----
From: Dorothy Bothne [mailto:dbothne54 at yahoo.com]
Sent: Wednesday, April 28, 2004 5:49 PM
To: coblist at deatech.com
Subject: Re: [Cob]plasters



--- dorethy at juno.com wrote asking about plasters
(snip)
> 
> Does anyone have hints or shortcuts to help me
eliminate the options that obviously won't work, to
make my determinations? > 
> Dorethy
> 

Dorethy,
We use a cement mixer and mix 1 50# bag of hydrated
lime (available at Home Depot), 2 70# bags of general
purpose sand, enough water for a smooth consistency
and some concrete color if you want something other
than white.
first we even out the surface with a nice mud plaster
(same ingredients as regular cob) then we use 2 to 3
coats of the lime mixture over the dried mud plaster. 
we wait at least a couple of days to a week between
coats. 
the first coat of plaster always cracks, but the
second and third coats are just fine.  And I like the
look of the rough texture so I don't smooth the
plaster too much.
I know that there are others out there who will gasp
at our process and I may get alot of negative
comments, but it's working great for us.
Dorothy 


	
		
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