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Back to your question – Calcium Carbonate added in ends up making a more self leveling putty than a gel for me no matter what I mix it with. ...
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There might be an issue adding only more solids (the calcium carbonate) to your paint since the paint is already going to be at the max binder to pigment ratio, so I would be adding the filler to some other liquid such as linseed oil or the medium rather than to just the paint.