I use 505 basting spray all the time and Love it. I also use Mary Ellen's best press starch on my fabrics when i quilt, and i have NO problem with the 505 working on starched fabrics.
The cans do feel "light" but they will do a queen size quilt and a few smaller ones. if used properly. You want a light coating of the spray on the quilt backing and then on the batting before adding the quilt top. It's hard to describe the amount of spray on there, but it is a light mist. perhaps similar to applying hairspray to your hair. Quick light spray.
No harm to fabrics, no odor, no need to have ventilation with this product.
We have a tutorial on our blog, which you can link to from the home page of our web site.
The successful use of the spray has a lot to do with how you prep your backing. it has to be smooth but not stretched.
The reason to use it rather than pinning is that it is very fast. Twin sized quilt takes maybe 10 or 15 minutes at the most and it is easy on the hands and back. Nothing to move or watch out for when machine quilting.
All those plusses - however, if you live in a humid climate and you are not air conditioned in the summer, the adhesive may release if you are working on something over a long period of time. i am a domestic machine quilter, and i spray and quilt and bind in a matter of days most of the time, so my quilts do not sit around to absorb humidity.
Lisa
Quilter's Paradise NY
www.quiltersparadiseonline.com