Re-stretching canvases - How does it work?

There can be various reasons why a painting needs to be re-stretched: 

• very high application of paint on the canvas, for example due to pouring technique or heavy mixed media
• warping of the stretcher frame due to transport damage
• incorrect storage, for example permanently high humidity
• incorrect hanging, for example, if a particularly heavy frame has not been hung in a balanced manner, causing the stretcher frame to warp.

In these cases, the finished artwork can be re-stretched. 

Attention.
The painting on the canvas must be completely dry before you stretch the canvas. 

To re-stretch a canvas you need a hammer, eight wooden wedges and some space. 

With each CRAZY CANVAS frame 40x50cm and larger, you get a bag with 8 wedges. Two for each corner of the frame. If you lose them, you can buy standard wedges from your local artist supply store.

Standard wedges are made of pinewood, but there are also extra stable wedges made of beech hardwood.

The hammer does not have to meet any specific requirements. You should only be able to wield it well. 

To stretch the canvas properly, place the painted, dry canvas on the front side. To avoid damaging the painting, place the canvas on a smooth, clean table with a cloth or on the back of a stable easel.

Now you can see the back of the canvas with the staples and the frame bars with slots in the corners.

Use a hammer to drive the clamping wedges into all corners. 

Caution.
To keep the canvas evenly stretched, you should gently tap the wedges into all 4 corners evenly, piece by piece. Also check again and again that the frame bars do not warp in one direction.