Roger helps you get the perfect ratio for your rendering mix. So, what's the best mix for rendering? It all depends on what you're rendering on to. The golden rule is you never make the mix stronger than the material that you're going on to. For example, lightweight concrete block that's 3.6kN, so we don't want a really strong mix for this because if the wall moves, which it will as you always get some expansion and contraction as the seasons change, you don't want the render to be the thing tha