I think code says if the garage is adjancent to any room in your house, you may
have to tape and have at least 1 layer of mud.

wrote:

I have a studio in my garage in which I lowered the ceiling. I've
finished all of the drywall on the walls. But I never got around to
doing the ceiling. No tape yet or anything. I was thinking.. could I
sort of wallpaper it with posters and not worry about finishing it?
Would it be as effective in covering the gaps and such?