Top coat not stuck

Wsoady93

New Member
Hi, I have too cost rendered two parts of my wall today (first time rendering) the first part has come out really well yet the second part at the end of smoothing it off started to come off the wall, I added 100ml of water just to get the mix sticking when I restarted ( straight after each other )

Why did my second lot not stick?

What mix and how much water should I use ?
I used 5 sand , 1, cement , 0.5 lime and added SBR into it.

Pictures are of the final first bit and the second is of the combed first coat
 

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