im doing a rendering job later on in the week, it on a side of a house I've all ways used 4:1 ration of sand and cement. I've been advised to do my next job with a 4:1:1 ratio of sand cement lime and I'm not quiet sure what the lime is if for and would it help me? I've been told it will make it easier for me to work with what are people's thoughts on this? Cheers