Hi. After the rain a big piece of paint peeled of the facade. It was the blueboard feature in the pic attached (charcoal top bit of house). Ive got one of the peeled of pieces of paint and its got a grainy finish to it. Cant tell if the blueboard was rendered then painted over or one of those texture coat paints finishes applied. How do i proceed? Paint looks faded as well so not sure how i would go with color matching. Do i need to scrape everything off, then repaint? Or can i just scrape of the flaky bits and give everything a paint over with new paint of similar colour?