Hi Diane
I always use Sharon`s method and use 505 to spray baste. I only made a small adjustment as this works out better for me and big quilts.
First I roll the back on one board and the batting on the other and spray baste it together with her method. After that I control and roll the back with the batting back on a board and the top on the other one and finish it her way.
At first I used the same method as with her handbasting, but folding the batting back and forth was very uncomfortable and not as accurate as doing it in two steps.
Hope this helps
Granny