some people love basting spray, some have problems with it. it is always worth trying new things to see how they work and whether or not they help YOU.
do not go to the hardware store and buy spray adhesive...it is a permenent bond will stiffen your project and is IMPOSSIBLE to sew through--gums up needles (if you can get them through it)
there are a number of different basting sprays on the market, if you do a search on 'basting spray' you will be able to see what brands others like, don't like, and the why's.
they are available at lqs' , joannes, michaels, hobby lobby...ect.