And go ahead and spray. If you don't have too large an area, you can use one of the hand operated sprayers available from Lowes, Menards, etc. It looks and operates similar to the old bug spray pumps. I have used them and they do an excellent job with much better results than trying to hand roller some type of texture material.
Check out:
http://www.homaxproducts.com/texture_5.html
Good Luck!
Dodgeman