Remove the loose stuff and see whats there.
If lathes mix up some stiff basecoat/hardwall/Browning and gently push it between the lathes to give it a key, push it in leaving a space to add the top coat. Wait for it to dry then top coat, using a straight edge, paint brush and water.
If its a solid wall, push in the Browning, leaving a space to top coat, then level with the rest of the wall.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!