Your paint by numbers canvas is a high-quality material. Just like clothing, canvases are made from cotton and linen, and they can be ironed. You need to be careful not to set the iron on a high heat though – keep it on a mid-range heat setting.
You should lay your canvas face down onto a thick towel and mist the back of the canvas lightly with water from a fine spray bottle. You just need to dampen the fabric rather than soak it. Gently iron over the surface, keeping the iron moving, and your canvas will be wrinkle-free within seconds.
Here is a homemade video our lovely customer Katia recorded:
We hope this helps! Happy painting!