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Thanks Steve. The undercoat is two layers of cement based render- six parts sharp sand/one part lime/one part cement mix. It's easier said than done to keep chipping off until firm, because when I lift a bit, it seems to loosen more- perhaps cutting it would be better so its not lifting...

Thanks Roy. The skim coat is actually 3mm (inc. paint) so I think it's probably just the photo making it look thicker. When you say Devil it up do you mean cut deep scratches in the surface? I know this was done between the coats of render. The surface is quite rough to touch but doesn't...

I've just uploaded a photo here.. //www.diynot.com/network/Graym0/albums/

Last year we installed a Newton system in the cellar and used a cement based render over the waterproof membrane covering the walls. We followed the instructions on the Newton site using six parts clean sharp sand/one part lime/one part cement. A two-coat application was applied leaving...