[Cob] Cob Countertop

[pauln]

I am building an alternative house and I am trying to find out how to 
build a sink and counter top for the kitchen.  I've followed the cob 
bathtub tread with great interest.  I am skeptical about a cob sink.  
It's not so much that I don't think it is possible, it's more that I 
don't think that that I have enough time to experiment to get it right 
(after all, it's only after a long time that you know if it will work).  
I am open to adding stabilizers, like lime and cement, but I'm still 
nervous about using it for a sink.  I'm not set on a cob sink, it's more 
the counter top that I'd like to use some form of cob for because it 
isn't straight.

Does anyone have any experience that would help me find the right kind 
and proportion of stabilizers I should use?  I would assume that I would 
have a better chance of getting the right mix for the counter top 
because moisture wouldn't be as much of a concern as a sink, however I 
would then be more concerned with how durable it is.

Any thoughts?

Paul
http://www.ravenisle.com/cob