>I think the acrylics are a great glue and use
>'concrete bonder' all the time to ensure that
>one layer of concrete or plaster sticks to
>another. The old time masons I work with say
>that they used to, and still do, just 'paint' on
>a paste made with pure cement powder and water
>between layers. I would use cement as the bonder
>if the surface had to breathe - but my fresco
>panels can breathe from both the front and back,
>so I do not forsee problems. You can also use
>the bonder in the final layer, if you purposely
>want lots of cracking in the surface (using too
>much lime in the mix), but want to make sure
>this layer does not peel away.
>
>The white cement in Canada is made in Canada,
>but the Asian one is one the market too, both
>are more expensive. White cement is about 30%
>stronger than grey portland cement, and it takes
>pigment well. I have some materials coming which
>advocate sodium silicate liquid in concrete,
>will have to see what they say.