If you're new to canvas stretching, stretching a canvas can be a bit of a daunting task. Most stretcher bar suppliers offer no instruction on how to use their product and your mostly just left to the internet to hash your way through a minefield of different information.
One of the main drawbacks for me when I first started canvas stretching was getting used to canvas stretching pliers. Awkward to hold, and in some cases, surprisingly heavy, these oversized bulldog clips lopped around. They'd mostly give me a stretch so unevenly tight, that once one image transformed from a simple picture of Big Ben into some weird Salvador Dali tribute.
Getting even tension across a frame, especially if you are "cut and pinning" your stretcher bars, requires technique and a lot of practise. Smaller frames are relatively simple, however the more you start moving up in size, the more often your tributes to Dali.
One of the main goals when we started Wunderbars was to "automatically" stretch a canvas. Machinery was out of the question. A lot of Photographers and framers work in garages, or out of homes. Sticking a stretching machine on the dining room table may stretch your table cloth over the table well, but it wasn't really our top priority. What we wanted to create was a stretcher bar that could stretch the canvas evenly on its own, that took up little or no space, could be done by anyone and removed the need for pliers.
Wunderbars uses unique spring loaded corner blocks. When you pull a pull pin out from the corner blocks of a Wunderbar stretcher bar, it fires a nylon piston. this spring loaded piston, gently pushes open the corner of the frame. You're stretching the corners, not different parts of the frame/canvas as you would do with stretching pliers. The pressure is relatively equal on the corners, creating a flat, smooth canvas. Free of ripples and as tight as the canvas allows. Basically, you let the bars do the stretching and no pliers required!
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Tim Jones is one of the three owners of Wunderbars Limited. He's a little bit (very) obsessed with canvas stretching.