I haven't read the other replies, so if this is a duplication, just chalk it up to my not taking time to read them!
They tell us around here at Guild, guest speakers, ect, not to use starch on quilting fabrics or anything else, for that matter.
Magic Sizing is what is used around here. It gives a nice feel to the fabric. It makes it feel like it did before washing/rinsing when first new. I really like to use it.
The reason for not using starch is because after it has remained in the fabric, bugs, ect, are attracted to it. I understood one of them to say the starch has live properties in the flour which attract the bugs.
Anyway, that is my answer to starch.
Mariah.