Opening a new paint by numbers kit is exciting, but that feeling can disappear fast if your canvas has stubborn folds, bent corners, or deep creases. It's very common for canvases to get bent during packaging, crumpled from tight rolling, or creased by hard folds. The good news is that these problems are almost always fixable. In this guide, we’ll explain why wrinkles happen and show you the best and safest ways to get your canvas flat and ready for painting.
Why Paint by Numbers Canvases Arrive Wrinkled
Knowing what causes wrinkles is the first step to fixing them. Here are the three main types you might see, using the same terms many artists look up when searching for solutions:
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Paint by numbers canvas bent‑up – This usually happens when the canvas is rolled loosely, and the edges get caught or pressed in transit. The corners and sides fold over, creating a bent, almost dog‑eared look that distorts the image's border.
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Paint by numbers canvas crumpled – A crumpled canvas has irregular, all‑over rumpling rather than clean lines. This is typically caused by the canvas being forced into packaging that is slightly too small or by multiple rolls being packed together, which crushes them.
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Paint by numbers canvas creased – Creases are sharp, straight lines that run across the printed area. They form when the canvas is folded (not rolled) for shipping, or when it is pressed so firmly against a cardboard tube seam that a hard line is etched into the fabric.
Most paint by numbers canvases are made from cotton or a cotton-polyester blend. Luckily, these fabrics respond well to heat, moisture, and tension, so you can fix even tough wrinkles without harming the printed numbers or outlines.
How to Remove Wrinkles from a Paint by Numbers Canvas
Here are the most effective and reliable methods. If you’re not sure about your canvas material, always test on a small, unprinted edge first. Never use high heat or steam directly on the printed side.
1. The Ironing Method (Best for Creased and Crumpled Canvas)
Ironing is the fastest way to fix a creased or crumpled paint by numbers canvas. Use low, dry heat and always place a protective cloth between the iron and the canvas.
You will need:
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An iron with an adjustable temperature
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A thin, clean cotton cloth (a tea towel or pillowcase works perfectly)
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A hard, flat, heat-resistant surface. Avoid using your ironing board’s padded cover; instead, use a table covered with a clean towel.
Steps:
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Lay the canvas face down on the flat surface. Never iron directly over the printed lines.
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Set your iron to a low synthetic or silk setting, with no steam. Steam can cause the ink to bleed.
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Place the cotton cloth over the back of the canvas, covering the wrinkled area completely.
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When the iron is warm, press it gently onto the cloth and move it slowly in circles. Don’t keep it in one place for more than a few seconds.
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Keep lifting the cloth to check your progress. The creases will start to relax and flatten. If your canvas is crumpled over a large area, you may need to work in sections.
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When smooth, let the canvas cool completely under the cloth to set it in its new flat shape.
Caution: If your canvas has a pre-printed textured gel coating, which some premium kits include, avoid ironing or use the lowest heat setting. High heat can melt the coating.
2. The Stretcher Bar Method (Perfect for Bent‑Up Edges and Overall Tension)
If your canvas arrived with bent-up edges, the best solution is to mount it on stretcher bars before you start painting. Stretching the fabric pulls it tight in all directions, removing bent edges and minor creases.
Steps:
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Purchase or reuse a set of wooden stretcher bars that match the size of your canvas. Many craft stores sell them, or you can order online.
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Assemble the frame into a rectangle or square.
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Lay the canvas over the frame, making sure the printed area is centered.
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Staple one side in the middle, then pull the opposite side taut and staple. Work your way from the middle to the corners, alternating sides to keep even tension.
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As you staple the bent‑up edges, the corners will straighten, and any slight crumpling will disappear. If the canvas still shows deep creases, combine this with a light misting of water on the back before stretching; the moisture helps the fibers relax as they dry under tension.
Painting on a stretched canvas not only removes wrinkles but also gives you a professional, gallery‑style result from the very first brush stroke.
3. The Moisture and Weight Method (Gentle for Delicate Canvases)
This no-heat method is perfect if you’re unsure about ironing or if your crumpled canvas feels dry and stiff.
Steps:
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Fill a clean spray bottle with plain water.
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Turn the canvas face‑down on a spotlessly clean, flat surface.
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Hold the spray bottle a good distance away and lightly mist the back of the wrinkled areas. The fabric should be damp, not wet. Don’t spray the front.
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Place a sheet of blotting paper or a dry, thin towel over the damp canvas to absorb excess moisture.
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Place heavy books, boards, or another flat weight evenly over the whole canvas. Make sure the weight is spread out so you don’t create new dents.
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Leave it for 12 to 24 hours. When the canvas is fully dry, most or all of the wrinkles should be gone.
4. The Hairdryer Tension Technique (Quick Spot Treatment)
If you have a single deep crease or a corner that won’t lie flat, a hairdryer can help.
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Secure the canvas on a flat surface using painter's tape at the corners, pulling it gently as flat as possible.
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Set a hairdryer to medium heat and hold it about 20 cm (8 inches) from the back of the canvas.
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Keep the hairdryer moving and warm the crease for 30 to 60 seconds. The heat will relax the fibers, and the tape will keep the canvas stretched.
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Let the canvas cool while it is still taped down. This method also works well after ironing if one stubborn crease is left.
Preventing Future Wrinkles
After you’ve smoothed your canvas, a few simple steps will help keep it in great shape:
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Store flat. If you're pausing between painting sessions, keep the canvas under a clean cloth with a couple of books on top.
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Avoid re‑rolling. Rolling a painted canvas can cause paint to crack and reintroduce bends.
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Frame early. Even a simple DIY stretcher frame works wonders. A canvas that is pulled taut from the start will resist forming new creases.
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Check the box at delivery. If the package is visibly crushed, open it promptly and follow the mist‑and‑weight method right away before the wrinkles set deeply into the fibers.
Don’t let this problem stop you from finishing your project. Wrinkles are just a result of packaging and shipping, not something you have to accept. With a household iron, a simple stretcher frame, or just water and patience, you can make your canvas smooth and ready for painting.
Spend a few minutes flattening your canvas before you start. Your painting experience will be more enjoyable, and your finished artwork will look much more professional, whether you frame it or give it as a gift.
