After tanking a wall interior, what type of sand would be recommended to use?

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sidean

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Hi All,

With regards to my question above, which sand will be best to use......
either plastering sand or Mersey grit ?
 
CTPlastering set me right on this a while ago when I did it but can I ask, what is the reason, what are the mechanics that mean you need sharp over coarse, is it creating the waterproof bond in the plaster, the sharp sand forms a tighter mix or something else?
 
Yep and it breaks your arm putting it on if u use silka 1 they state on label only sharp sand fine sand breaks down n cracks
 
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