![]() The canvas needs to be 4′ x 7.’ I’ve found a source for commercial stretcher bars in the 7′ length, but I’d still need to figure out how to cross brace it, to prevent warping during the stretching process, and the 7′ lengths are pretty expensive to purchase and ship. I’ve got a commission for a mural-sized painting on canvas for a children’s hospital. I’m facing one of the above situation right now. Your local art store is unlikely to carry commercial stretcher bars in long lengths and I’ve never seen them available anywhere beyond 7′ in length. Commercial stretcher bars are only available in one inch interval lengths (12,” 13,” 14,” 15″…etc.), not fractions of an inch. You could buy and assemble commercial stretcher bars. To achieve this you’d only need to stretch the canvas. You want to be sure the canvas has been sized & primed following proper archival procedures.There are occasions/arguments, for building your own canvas from scratch, however: I don’t have to spend days, buying the lumber at the lumber yard, fabricating the stretcher bars, stretching the canvas and, if I’ve chosen raw canvas, sizing and priming the canvas, with multiple coats of acrylic gesso (sanding each coat), before I can actually put the canvas up on my easel. I’m ready to start painting as soon as I get it home. I’m all for the convenience of buying a commercial pre-stretched canvas at my local art store.
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