Render mix ratio

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yogi2dab

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Morning all, I'm looking to render 3 garden walls, all made from 7.3N dense concrete blocks. The render mix I plan on using for the scratch is 5 sand, 1 cement, 1 lime, splosh of waterproofer, for the top coat, 6:1:1 but no waterproofer. Any recommendations based on the wall being made from dense blocks? Is it good practice to put lime in both coats or just top? I've done plenty of internal plastering before but never render so just want to put to bed any niggling doubts over my method before I start
 

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