What, exactly, do you mean by "STUCCO"?
And what exactly do you mean by a "CEMENT BLOCK WALL"?
If you mean a foundation wall below grade and you simply want to parget is, this is one thing...
If you have a house where the walls are 'framed' with block and you want to actually 'stucco' these walls, that is another thing.
If you you want to apply "SYNTHETIC STUCCO", this again, is another thing altogether...
Sorry to be 'difficult', but what you mean does 'matter'...
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