My husband and I stretch my canvases together. One of the problems we had using a staple gun (electric) was the varying hardness of the stretchers. Sometimes the wood was so hard the staple would not go in all the way or it would be too soft and the staple would go too far and cut the canvas. We couldn't tell what to expect, even on the same stretcher bar, because sometimes the wood is pieced. So we switched to tacks and it works much better.
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