cost - up to $20 a can, depending on where you purchase it. Joann's doesn't carry it so no coupons to help there. Also have not seen it at Walmart. I purchase mine at my quilt shop and Lowes/Home Depot also usually carry it.
reposition? = yes, this is the best thing about it, it's a temporary spray, so you can reposition it. I had to on my last project and by holding one hand on the lower layer, I could easily pull up the top layer and move it. You don't have to respray in this case, there is plenty of "tack" left to simply move the fabrics and reconnect them in the desired place.
The number of quilts you can use it on depends on how much you put on each quilt. It doesn't take a heavy spray to do what you need to do...no sense wasting the spray, and too much can make it more difficult to reposition fabrics if you need to. I try to get an overall coverage without getting it too heavy. I use my hand to test by gently pressing my hand onto the surface sprayed. If I can feel that the surface is tacky, there is enough on there to do what I want.
here is one site with more information...hadn't heard about the Aqua Net tip, and not sure whether I'll try it or not. I've read other comments by users of 505 about how long the adhesive holds, how good it is, etc., so probably will continue using it for my work.
http://ths.gardenweb.com/forums/load...173012814.html