[Cob] Limewash

[Rodger Chenoweth]

>
> Hi there,
> I'm doing a lime plaster on a cob structure, and having a hard time 
> figuring out how limewash sets, and works generally.  It seems like 
> the result is the same whether I wet the wall ahead of time or not... 
> both cases end with a wall coated in lime.  Both whiten nicely, but 
> neither seem to harden.  Every other coat of limewash seems to bring 
> out the sand again, and just add more lime to the lime that was there. 
>  Is the idea to keep doing coats so that the lime builds on itself so 
> that eventually it covers all the sand particles?  And is it supposed 
> to turn into a dust free hard surface?
> Cheers
> Rodger
>