Last week I stripped our king size bed down to the mattress pad to wash the sheets. I was getting ready to sandwich a quilt and since my sewing area is in our master bedroom, I just used our bed to lay it out, backing fabric first. As I began to pull the backing fabric into position I realized it flat out wasn't going to move unless I lifted it up and repositioned the entire piece of fabric! The mattress pad is vinyl backed and has a knit tricot top to it, so it was holding the fabric in place. I then just pulled at the four sides until the fabric was stretched nice and smooth, then sprayed (505 spray) one side of the batting, smoothed it onto the backing fabric, then sprayed the top of the batting and smoothed on the quilt top. It worked PERFECTLY! Now I'll be sure to save up my sandwiching for the days I wash just the sheets!