Originally Posted by Prism99

I don't have this problem. How much are you spraying?

I heavily starch my backing fabrics before layering. My method is to mix a 1:1 solution of Sta-Flo liquid laundry starch and water, "paint" this solution on until the yardage is saturated (using a large wall-painting brush), toss in dryer, then iron with steam. Starching like this stabilizes the backing fabric so it does not pucker while machine quilting.