The good news is that some wrinkling for canvases of all types is VERY normal. Wrinkles on paint by number canvases are more common due to the printing of the numbers and lines, which also makes it a little more challenging to deal with. I’ve compiled a few beginners tips to get your canvases smooth and looking great. There are two basic methods you can use to remove wrinkles – ironing, or blow drying.
Note: Many websites suggest using a little bit of water or steam when ironing. You’re welcome to try doing this, but paint by number kits are different from regular blank canvases in that they have numbers and lines printed on them which may be accidentally steamed off.
When ironing, make sure to press down firmly on the back of the canvas, and make sure that you never keep the iron in one place for too long.
Canvases are made to be stretched, and the stretching process helps to get the last wrinkles out. Try to make sure the canvas is as tight as possible, even when just taping or tacking the canvas to a flat surface!
If you can’t get the wrinkles out without water, and you don’t have a VERY fine mister, I recommend laying the canvas face down, and ironing with a damp cloth on the back.
Use your blow dryer on high heat on the back of the canvas. Ensure you are stretch the canvas and keep it taut during the process. Keep the hot air concentrated on the wrinkled area as you’re stretching the canvas out.
Using a damp cloth on the back of the canvas before blow drying and stretching may also help to get the tougher wrinkles out.