What are Canvas Wedges and what are they used for? Canvas Wedges (also called canvas keys) are wooden wedges that are often found stapled to the back of new canvases. After sometime a painting canvas may begin to droop. This is caused by the weight of the paint being pulled down by gravity. The wedges are used to slightly push the canvas frame apart pulling the canvas material tighter. If you have any painting questions for me leave them in the comments below. Cheers friends.
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