Using Waste Canvas
When you go to a yarn store, you may see some canvases which have extremely thin threads. This is known as throw-away or waste canvas. The purpose of waste canvas is to create needlepoint stitches on a background of regular fabric. Woven yardage usually does not accept needlepoint stitches. Often, the weave is not correct.
A word of warning! Never use waste canvas for mono, interlock or Penelope canvas. The canvas threads are too thin and will not have enough starch to hold it properly straight. Waste canvas is just that. It is for a temporary grid on a permanent ground. It is meant to be thrown away after stitching. Never let a shop owner tell you it will be ok to substitute for another canvas. You will be wasting your time and money on something that will not hold up in time.