Hi, I've built a couple of retaining walls on the garden boundary and now want to render and finish with a tyrolean finish. I've got 50/50 sand, cement, waterproof PVA, a bag of hydrated lime and a plastisiser. The block walls are pretty true and should not need a very thick rendering. I just need a little help with what do I do first , strengths, and mix ratios and thicknesses. Any comments very much appreciated.