Hi all, I have just finished painting the outside walls of the bungalow, I have some liquid clear waterproofer I got from BQ years ago, I tried a small patch then on the wall and and it worked great like the wall was wearing a plastic mac. I was going to coat the bungalow walls with it now that it's painted, but I have been told I should have used the waterproofer first, that seems strange to me, any help please. REG