Hello again Mark,
I just sent a reply to your post about coatings, so I'll offer my 2ยข worth here as well. And by the way, the Eco Print Shield offer excellent flexibility for stretching, no cracking on edges or corners. However, as with any coating, it's always a good idea to do one more coat on the edges and corners after stretching for added protection. I've actually had stretched canvases come back that had obviously been grossly mishandled and some of the coating and ink had been taken off, mostly on edges but also other areas. I used ink I had retrieved from used carts to retouch and then recoated those areas.
But, more to the point, I am familiar with the Peel and Stick Stretchers and I would never consider using them. Even though they do offer a more substantial bar for large sizes, it is NOT a professional finish in my opinion. Yes, it is quick and easy and probably adequate for amateur work, but not when you are printing for pros or you own work that you'll be selling. That system relies on that adhesive on the bars and also glue applied to the area where the bar and canvas meet. NOT a good idea at all. I've seen more that one occasion where a canvas has had to be re-stretched after a period of time due to humidity changes and natural stretching and sagging. This is not uncommon. However, it would be virtually impossible to do so with the Peel and Stick procedure. Also, you cannot rely on the adhesive that's on the bars to last forever. Then you'd be stapling anyway, so it's all for naught. If you are determined to use that system I would suggest that you leave extra canvas, don't use the glue and staple on the back of the bars as is done with a normal wrap. Just a thought.
Gary