Hi, I am building an extension and have a very long wall that has a movement joint in it at about 5m. The joint goes through the brickwork and the blockwork into the building. I am intending on dot and dab plastering and will need to install a control bead along the line of the movement joint. The question I have is how can i finish this off so you don't see a visible vertical line running up the wall? I was thinking of filling the metal control joint V with a flexible sealant that can be finished nice and smooth and then decorating over it. I realise that this may crack in future but i think I would prefer this to a shadow gap running from floor to ceiling. Any suggestions greatfully received.