External rendering help (lime? plasticiser? Mix.)

Joined
7 Jan 2012
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Location
Sussex
Country
United Kingdom
Hi

To render a concrete block garden wall, should we:

1. Mix 4 sand to 1 cement and 1 lime
2. Use hydrated lime
3. use fine sharp sand 0-2mm
4. Use a plasticiser/waterproofer and if so which one (some say don't mix with lime)

I have found somewhere to order most of this on one to and they don't have plastering sand and say the above is good/ the same...

Thanks!!

Would love just to get a pro in but can't afford it and my father in law has offed to do it, I just need to order the materials!
 
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