You lay your backing down wrong side up, spray that. Lay your batting down and smooth it out. Spray that. Lay the top right side up and smooth it out. A queen size definitely needs 2 or more people to lay out all the layers. If you are using Sullivan's, be sure there is a lot of ventilation or do it outside. The other sprays are good inside. I particularly like 505 but I recently found 606 so need to try that.
There is no shifting. The adhesive is really good as long as you have smoothed it out. I now have a bowl full of pins that are never used. Anyone out there want them?
judee