Why do you want to mix a waterproofer with plaster, what is it are you trying to achieve? It won’t improve the workability & will probably make it worse! Why do you want to increase the workability?
Bonding plaster, like all the other plasters available, is perfect providing you use it for the correct application! If you give us a more information on what you’re trying to do/achieve we may be able to better advise you.
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