How to Flatten a Paint by Numbers Canvas

To flatten a paint by numbers canvas, start by laying it flat under weight for several hours or overnight. If the canvas is still curled or wrinkled, use gentle moisture, low heat, or careful hand-stretching depending on whether the canvas is blank, printed, or already painted.

Before You Start: Check the Type of Wrinkle

Wrinkles can happen because a canvas was rolled tightly, folded during storage, exposed to humidity, or stretched unevenly. Before using heat or moisture, check whether the canvas is unpainted or already painted. A blank canvas is easier to flatten. A painted canvas needs a gentler approach so you do not damage the paint.

Fastest Safe Method: Flatten It Under Weight

1. Place the canvas face down on a clean, dry, flat surface.
2. Cover the back with a clean sheet of paper or cloth.
3. Place heavy, flat books or boards on top.
4. Leave it for a few hours, or overnight for stronger curls.

This is the safest first step because it does not use heat, water, or chemicals. It works especially well for a paint by numbers canvas that is curled from shipping.

Use a Slightly Damp Cloth for Stubborn Curling

If the canvas is still curling, lay it face down and place a slightly damp cloth over the back for about 10 to 15 minutes. The cloth should be damp, not wet. Too much water can affect the printed numbers or canvas texture.

After that, remove the cloth and place the canvas under heavy, flat books or boards until it dries completely.

Can You Iron a Paint by Numbers Canvas?

Yes, but only carefully. Use an iron on the lowest heat setting, turn off steam, and place a clean cloth or thick paper between the iron and the back of the canvas. Press gently for a few seconds at a time. Keep the iron moving and avoid direct contact with painted areas.

If the canvas is already painted, use extra caution. Too much heat can soften or damage acrylic paint.

Hair Dryer Method for Unpainted Canvas

A hair dryer on a low setting can help relax light wrinkles on an unpainted canvas. Keep it a few inches away from the canvas and move it constantly. Do not hold heat in one place, because that can warp the canvas or affect the printed guide.

What Not to Do

• Do not soak the canvas in water.
• Do not use high heat.
• Do not iron directly over painted areas.
• Do not pull the canvas aggressively by the corners.
• Do not leave heavy pressure on a freshly painted canvas.

How to Prevent Canvas Wrinkles Next Time

Store your canvas flat whenever possible. If you need to roll it, roll it loosely with the printed side facing outward. Keep it away from humidity and avoid placing heavy objects on folded edges.

If you are starting a new project, browse our paint by numbers kits and accessories to choose a canvas that is easier to prepare and display.

Final Tip

Start with the gentlest method and only move to moisture or heat if needed. Most paint by numbers canvas wrinkles can be fixed with patience, a flat surface, and a little weight overnight.