Paintings

What can go wrong with a stretcher and what you can do?

As the purpose of the stretcher is to ensure that the canvas is kept taut, it is obvious that a stretcher which can no longer be keyed out is not performing its function properly.

One of the most common reasons for a stretcher to fail is that the keys become damaged-with the protruding end breaking off and the remainder of the key becoming lodged in the keyhole. The removal of the remnants of the key is usually a job for a conservator, because it involves separating the two stretcher members.

In some cases, a stretcher will not remain keyed out and keeps pulling back. If the reason for this is not clear—such as material caught in the key holes—you should consult a conservator.

Sometimes stretchers warp and the temptation is to replace them. If, however, the canvas has taken on the plastic memory of the warped stretcher shape, then replacing the warped member with a straight one may cause more problems than it solves. If in doubt, consult a conservator.