The old roughcast has been hacked off a brick house back to the brick . The client (as they do) has asked if we can rendagrip all the bricks before we coat it then roughcast again . We've used rendagrip on patches before on other jobs and it's worked fine. Bit apprehensive about using it on a while house tho. He doesn't care about the cost of the rendagrip. What's your thoughts on here about it ?