It's hard to mess up with papercrete :) Are you cooking the test blocks?
On the outside - check :) I made a test batch, I have no idea if I did it right as in the process I got confused how much of this vs. that - my tests should dry for me soon and tell a story :)
From: spaceman <Spaceman@starship-enterprises.net>
To: papercreters@yahoogroups.com
Sent: Tuesday, May 28, 2013 4:34 PM
Subject: Re: [papercreters] Re: Borax
Maybe pressed inside a bucket or trough. On the outside it would probably crack as it shrinks. You might be able to pull a bucket out at just the right time but it would not be easy to avoid breaking the soft papercrete
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