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Thanks for the reply. Usually leaving the render at least 24 hours before skimming. Why is a stronger mix prone to cracking? And why does the drying time make the difference? I'm not questioning your pointers but interested in the science behind them.

Thanks for the feedback guys...Let me throw in a little more background. I work for a damp proofing company. The specs set out for waterproof render for damp proofing is 3:1. Over the years I've used a waterproof scratch and top coat and then moved in to using waterproof scratch an non...

Yep, the top coat is always keys with swirling lines.

Hi everyone :) I'm new here...I'll cut to the chase...I've been having a problem for many years. I apply waterproof render to a wall brick wall. 3 sand, 1 cement with sika 1 in scratch coat. Top coat same mix without sika. Let this dry out and apply skim. Skim always hairline cracks...Any...