I just did this too - I usually sew the sleeve into the binding, but forgot on this occasion and couldn't face undoing the binding again. Adding the sleeve afterwards seems to have worked well - but this is a fairly small wall hanging.

I always put the sleeve on after the binding. I make my tube then I cut a piece of Steam-a-Seam about 2/3 to 3/4 the width of the tube (depending on the diameter of the rod) and attach the tube to the back right below the binding. I've never had a problem with the tube becoming unattached and it doesn't show from the front.

What size pieces are you hanging with this method (i.e., Steam-a-Seam)? I wouldn't trust it with large wall quilts and certainly not with hanging lap or bed size quilts. The quilt in question is 54" x 69", fairly large to hang 'by glue', but that's just my opinion mind you.

If its a wall hanging, I like to add the sleeve before I do the binding, I do it differently for a larger quilt.

If it is for a show or you think you may enter it into a show then you need to follow national guidelines. AQS has a description of what they want and most states I have been to follow those. A completed 4" sleeve across the back of the quilt. If you've done such a good enough job you want to display the quilt, then make the sleeve as if you were entering a quilt show.

Sorry I don't have the site right now.

ali

NQA has instructions as well.
http://nqaquilts.org/2012show/quiltshow.php?ID=251