Thanks for the reply I spoke to my sisters partner and showed him the situation he wasn’t too sure about if it had be done befor as they haven’t been there that long in the end he just wanted it to be touched up and try make it look like bricks? even tho I said it looked pretty bad and render might not be the answer, done what could be done but can’t see it lasting and I’m no expert ?? How long do you give it a month? ?