ceiling painting

What is the requirements as far as the final finish after a knockdown ceiling does it remain finished at that point or are most seeing it primed and painted after. Here where I live we have never treated it as one done in popcorn but rather always treated it like all finished drywall and made...

I need small texture sprayer for mostly small job not sure which one is good for that. The problem is i have to match texture in my job and i need really good sprayer where i can adjust things to match existing ceilings. So i am just interesting if someone can suggest me what brand to buy and...