I always use a product called keim render. Its perfect for what you are looking for, although make sure whoever puts it on has used it before as its not applicated the same way as normal render. They also sell the special paint for the render or you can have it ready mixed in with the render. google up keim render or keim paints and check it out. Theres some pictures on my website of a barn ive just used it on, if you want to take a look Google "capable-construction.co.uk" If you need any more info id be happy to help.