Hi, I've just had an internal wall taken back to the brick and then plastered in lime instead of gypsum. We went with lime to help deal with a very slight historic damp problem at the very base of the wall as this was recommended to me by a couple of surveyors (it's an old building). The plasterer was also recommended to me and seemed to do a good job with the scratch coat. But yesterday he did the so-called finishing coat and it's a real mess (pictures attached). He told me it was all done but when I complained, he agreed to come back in a week and do another finishing coat. I didn't pay him the final amount (the rest was paid on his 2 previous visits), which is why he's agreed to come back. Trouble is, I now have lost all faith in his abilities. I know lime is trickier than cement, but surely there's no excuse for the mess he's made? He certainly gave the impression he knew what he was doing until now! Should I give him a chance to come back and have another go or am I within my rights to withhold the final 30% payment and find someone else who can do it properly? Any advice gratefully received! Many thanks.