Patching internal sand / cement plaster

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ran1

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Can someone please give advice on how best to patch sand and cement internal render under a problem (leaky) window in my 1940's semi?

I think I have sorted the leak bout was going to add waterproofer or sbr to the mix anyway.

The overall depth is approx 12mm.

Will I require 2 backing coats before a final skim of multi finish?

I'm aware that the backing coat must be scratched before applying the second (float) coat. But do i need to scratch the

float coat ready to accept the finish skim?

Timing and bonding advice between coats would be appreciated.

Thanks all :)
 
ran1 said:
Can someone please give advice on how best to patch sand and cement internal render under a problem (leaky) window in my 1940's semi?

I think I have sorted the leak bout was going to add waterproofer or sbr to the mix anyway.

The overall depth is approx 12mm.

Will I require 2 backing coats before a final skim of multi finish?

I'm aware that the backing coat must be scratched before applying the second (float) coat. But do i need to scratch the

float coat ready to accept the finish skim?

Timing and bonding advice between coats would be appreciated.

Thanks all :)
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Do both s/c in the same day , use washed plastering sand and as you have said with waterproofing additive is good ,set day or 2 after , best of luck with it
 
Thanks Keithuk. When you say "set" does that mean multifinish (skim)? And do I score before I skim....Thanks for the help! :D
 
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