In basic terms, the value of tension for a canvas stretcher is crucial to its future life. Uneven tension may eventually lead to creases and, possibly even, separation of the paint layers from its substrate. Key-expandable stretchers date back as early as the second half of the 19th century. They automatically corrected the process of progressive canvas re-stretching by expanding the corners of the stretcher, although they were let down by their mechanics, which were not up to the task. Derivan CanvasJack on the other hand is a long term stretching solution .

Introducing Derivan CanvasJack System of Pre-Stretched Canvases

The Canvas Jack System included in these artist quality pre-stretched canvases is designed to easily, quickly and evenly adjust and control tension on the canvas surface. Available in acrylic primed Cotton and Linen quality in a variety of frame sizes and featuring gallery wrapped canvas with corner folds (no trimmed corners). Bars and braces are manufactured using sturdy, straight and clear (no knots) Popplar wood.