FYI, I was told that the problem with over thinning with water isn't an issue with paper and some porous surfaces like untreated wood, but is with gessoed canvas and panels.
-Lynette 


On Fri, Sep 12, 2014 at 12:23 PM, Karen Ackoff <[log in to unmask]> wrote:
The ground might also be a factor. 
K


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