First of all, I tack an old sheet to my hallway wall and also set one on the floor beneath it. This takes care of overspray issues. Next, get the pets and kids out of the way so they don't stick to the wall or breathe the fumes. If I am making a large quilt I usually use a few pins to attach the bottom layer (back of quilt) face down to the sheet. Spray to completely cover. Wait a couple of minutes then cover with batting (I only use W&N 100% cotton). Smooth out all wrinkles without stretching and reposition if necessary. Spray batting and wait a couple of minutes. Then position quilt top face up smoothing out wrinkles without stretching. If your quilt is very large you may have to do half at a time but it is still way easier and quicker than hand basting or pin basting and helps to prevent shifting when you are quilting.
I have used 505, Sullivan's and June Taylor. I buy Sullivan's most often because it is less expensive than 505 (I get it on sale or with a coupon at Hancock Fabrics) and the fumes are not as bad as June Taylor. They all get the job done. If you are making lots of charity quilts you will really appreciate the amount of time you will be saving and the number of backaches you will be eliminating by using the spray basting method and you can be a bit frugal when applying it so you'll get several small quilts out of each can.