I do like doing a bit outside! But not this time of year! Private customers can be talked round but this bungalow we're doing for a builder won't wait. Done all inside now and scratched all outside. It's over grey thermalite blocks on most of it where the new walls are. And a few reds on the old but they're not big areas. We didn't put any waterproofer in to get the suction and we were goin to be topping it with a 6 1 1. But bit worried about the frost getting it in the early hours. Has anyone tried it with frost proofer in or rapid hardener? We've never bothered with it but thinking about giving it a go