basting spray is *repositionable* ; spray glue is not- make sure you purchase the right product. if you use a glue it may dry and be permanent , may wash out- might not, may stain the fabric- or cause hard areas which do not soften up. when you purchase the 'Basting Spray' read the can & follow the instructions for the best outcome. start with one side- smooth the fabric over the batting- allow to dry, flip over, spray the second side, smooth the fabric over that side of the batting- allow to dry. some people pin around the edges - for small projects it is not always necessary- but often on large projects it helps to keep the edges together as you manipulate the quilt through the quilting process.