To change the topic a little but it is still relevant. When you stain various plasters with thinned acrylics remember that the harder or denser the plaster, the rate of stain absorbtion is different. This can be a problem trying to match castings with fill material in the joints. While it is soft and requires a good base I like dry sheetrock mud. I usually use the 45 minute setting version. Mix it your self with water and it drys fairly quickly. Pre mixed uses a glycol base and takes a lot longer to dry.
Hope this is of interest.
George Lasley
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