Done a bit of this roughcast using k-rend dash receiver and their bagged roughcast to top, It's knacky but once you get a feel for it easy enough, the place i did had to match existing buildings on a hospital complex and we were spot on after a bit of trial on sample boards, this was top half of building under rafters and soffits of course. On blockwork: masked up as usual, this is a messy undertaking, sprayed k-rend standard base coat just about the same as you would float s&c rubbed up with foat and nails for a key, nice stuff to float with , we used 10mm beads. Left it for a few days to cure/dry, we then sheated up underneath where brickwork was with blue lightwieght tarps, we only had two so sectioned accordingly, butter coat of dash reciever then dashed it after it tightened up, we seemed to use the same amount of bags to buttercoat as we used to dash. The buttercoat goes on like a heavey skim coat and then the messy stuff begins, dash has to be mixed and correct thickness for good results, we found when you scrape around the edge of tub with gauging trowel a sharp egde just visible and don't dash too thick, as i said it's knacky but you soon get the craic weighed up. I used a jug to put dash into bucket and the harling trowelled onto wall, The clean down process is quite quick if you have prepped correctly, results are satisfying and you can prep your next bay or do what you want, reveals are just rubbed up reciever. I was told in if you have to match a bigger wet dash aggregate to mix suitable stone with dash reciever and bobs your uncle and only the one product coloured product to buy, hope this helps someone sometime.
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