Oh here goes, I will try but await been shot down, sbr for outside, never use pva outside, you can paint sbr on neat, mixed with water from one to one to five to one,you can also mix it with neat cement and paste it on, leave it for 48 hrs,you can add it to screed in the water for hardness ,you can put it on a floor before screeding ,its ratios depends on what exactly you are going to do with it, me personally if I am scudding over old render I mix it in the water at 3/1 , I don't put it in the render after that, hope this helps a little