When I rolled my top with 303, it took nearly a quart bottle to do the top. Rolling it is so much easier than spraying it on and you get more of the 303 product onto and into the top. My thread on applying the 303 to my top with a roller is here.
http://www.camaro5.com/forums/showth...=481360&page=2
You will not be disappointed with the 303.