That's all i ever used to do, the old 321 but a few years ago the company i worked for had major problem's with cracking roughcast, was a very stressful time for me cos everyone thought i was the cause of it. Turn's out it was the block company's fault and there was to much calcium oxide(something to do with coal) in the block's which resulted in them expanding and contracting enormously, thereforth cracking the render. Before this was known we shifted to k-rend to combat this problem and never really went back to the old way. Just wanted to hear other peoples thoughts on the wet dash s**t..