
The explanation is quite simple: 'cement render' contains cement, and 'acrylic render' does not.
Cement render comes dry, i.e., requires hydration to activate, acrylic render comes already wet, i.e., in a pale or a bucket.
Cement render dries solid and brittle, and is prone to cracking if ever there is movement in the walls, whereas acrylic render remains flexible and can absorb a small degree of movement, as it is essentially a sheath, or a coating.
Cement render can be applied quite thick, i.e., up to 15mm depending on the substrate, whereas acrylic render is usually used more so as a skimcoat, since it relies on evaporation to set.
The only thing these two products have in common is that they are both applied by trowel and done so by a renderer.
Both systems have their limitations and their own list of pros and cons. For best results, they can be used one after another to achieve the best of both worlds!
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