MAte use stonepack enhanced base coat, it stick to absolutely everything. What you put on top is up to you but that stuff is hard to beat. You have to watch though because if you get a bit stuck under your boot and walk over a driveway or path your in trouble, take that from experience.Have been asked by a friend to do 2 or 3, 1m2 patches to his render(floated sand and cement), the problem I have is he has already freshly put on his first coat of paint. Looking for the best way to get the paint off as I have never had to do this? Cheers