Do you have to use a fine sand paper and sand the surface of the PVC before spray painting it with a Krylon Fusion or any other paint?
My first set of elbows I spray painted them without sanding an they look like @#&*!!
If I remember right, Fusion says on the back of the can it takes 4 days or so. I'd just read the can and do what it says, no mystery there. Might also want to think about two coats, as the paint does come off fairly easily with some handling/cleaning.