Hi, I'm a DIYer in my spare time. I've picked up most things, including plastering (Mainly skimming), which I'm quite good at. A room I'm going to replaster - walls / ceiling, the plaster has blown from behind the radiator and I've pulled it off, the rest is sound. I did similar in another room and I struggled with the cement render when patching up. Cement doesn't seem as easy to handle as plaster. Can anyone give any advise on the mix / ratio, and how best to approach it? Should I use PVA 1st? I'd rather use a cement render than something like hardwall as I want to do some rendering outside this year and its good practise. Thanks in advance!