Cowboy Nail Designs How Do You Smooth Ceilings With Unlevel Plasterboards?

How do you smooth ceilings with unlevel plasterboards? - cowboy nail designs

I decorate my room and IV came from some manufacturers veiw my property, but leaves me confused, some say, everything set in the first place and others say that the fact the culmination of a fine plaster, and then skimmed with plaster is right and who is a cowboy was?