For my photography gallery wraps, printed on a large format Epson Stylus Pro 4800, I use the HP Professional Matte Canvas Q8671A, because the Epson Stylus Pro 4800 uses aqueous based inks, I have to coat the finished canvas prints prior to making the gallery wraps, and use Lexjet Sunset Satin coating, which gives the finished wrap a nice semi-gloss look, and really brings out the detail.
There are several ways to apply the Lexjet Sunset Satin coating on the gallery wrap, I have tried spraying with a HVLP rig, however I found that applying the coating with a brush give a a nice hand-made finish to the wrap.
I build my own gallery wrap frames by cutting down 1x4's on a table saw, it's not a big deal and I can make any size I need. My finished frame is 3/4" x 1-1/4" which gives a nice wrapped effect, but not over bearing. The one part to remember is to bevel the edge of the frame about 3° that goes towards the front, so the edge does not telegraph (show) on the front of the finished wrap (see drawing below). I
After running the 1x4 through the table saw and making the frame profile as shown in the drawing below, I mitre cut the pieces as you would a picture frame, put a dab on wood glue on the joints, and secure with a small brad nailer.
After the frame is complete, I stretch the canvas over the frame and secure on the back with 1/2" staples, add a small "D" ring for a mounting wire and it's done.