Putty filling and latex paint brushing
First of all, we use caulking putty to fill the gap and fill the gap of gypsum board ceiling; Then wait until it is dry, then stick it on the gap with elastic cloth and repair it with good quality white latex; Although you can start scraping putty after gluing, then brush latex paint.
Gypsum water filling
First of all, clean up the loose gypsum in the gap, enlarge the gap, and then clean up the remaining small dust and other debris with a vacuum cleaner; Next, brush the gap of gypsum board wet, pour a thick mixture of gypsum and water, and smooth the gap of gypsum board; Wait for drying for about 24 hours, and then gently polish it with fine sandpaper to make it smoother; Then brush the primer, and then brush the gypsum board latex paint.