Hi I have built a block outbuilding at the bottom of my garden. It is a project that I have done all the work my self to keep cost down. It is single 100mm block rendered sand and cement. It has a studded wall in side and plaster board ceiling these are all fine but the exterior wall I dot and dab on advice from some one who works in the trade (yer just dot and dab it be fine it's only a outbuilding) I can now see the dabs through the paint i now understand (after looking through on here) I have messed up and created cold spots every where. Before I rip it all of and try to figure out what I'm going to do is there any thing I can do put on or will air bricks or skiming it with any thing any advice I no picture isn't the best can get more if needed and when the dots show up more