Gessoed canvases on stretchers are also available. They are available in a variety of weights: light-weight is about or ; medium-weight is about or ; heavy-weight is about or . They are prepared with two or three coats of gesso and are ready for use straight away. Artists desiring greater control of their painting surface may add a coat or two of their preferred gesso. Professional artists who wish to work on canvas may prepare their own canvas in the traditional manner.