Long time and frequent user of the Hahnemuhle/IG Pro bars here. I also use a staple gun to augment the glue and adhesive strip. We do large canvases pretty frequently, including a recent 4x12 foot pano (four 4'x3' panels). I do a slight alteration of their recommended assembly, it stretches much tighter and doesn't have any corner sagging. After positioning the assembled frame on the back of the print, I cut the corners off the paper (I'll upload a (horrible) graphic of my method, since I'm not at our print studio to take a photo). Hope this helps.