As for cracks in drywall, you should make use of a scraper to widen the crack and location drywall tape around it. Implement a joint or drywall compound and press in the crack. Sleek more than having a sponge. Then just sand, key, and easily paint it about. Lookup Lookup https://docs.google.com/drawings/d/18suWOLnxj46oZOfkZmRP9qd5QlSwz3BGXU3CzHM0Oew/edit?usp=sharing