hi all!been asked to do a job!its on ecotherm polystyrene blocks pumped with concrete!the system architect wants is for it to be finished with sand and cement smooth render or stucco!obviously the ewi needs to be fibre meshed first with a base coat but not sure which base coat system is best for use with a sand cement finish!and more to the point not sure if it can be done as wondering if to heavy!have thought of weber rend aid 2 but not going to do anything without sound advice first !thanks guys!