How to Remove Wrinkles and Creases from a Paint by Numbers Canvas
Wrinkles and fold lines on an unpainted paint by numbers canvas are usually easy to fix. The cotton-linen blend used for Paintarthub canvases is flexible and easy to reshape with moisture, pressure or gentle heat.
Quick Answer: For most creases, dampen the affected area with clean water, lay the canvas flat and press it under a flat, heavy object for at least 12 hours. If you want a faster result, iron the back of the canvas on low heat, preferably with a steam iron. For severe or widespread creasing, the entire canvas can be soaked in clean water and left to dry flat.
These instructions are specifically for an unpainted cotton-linen blend paint by numbers canvas.
First, Check What Needs Flattening
Not every uneven canvas needs the same treatment.
| Canvas condition | Best approach |
|---|---|
| Light or normal crease | Dampen the area and press it flat |
| Deep crease or you need a quick result | Iron the back on low heat |
| Several strong creases or widespread wrinkling | Fully wet the canvas and dry it flat |
| Very faint surface ripple | Usually no treatment is necessary |
A visible crease that creates a raised line or prevents the canvas from lying comfortably flat is worth removing before painting.
A very slight surface ripple is different. If the canvas lies flat enough to paint normally, there is no need to repeatedly treat it just to make the surface perfectly smooth.
Method 1: Dampen the Crease and Press It Flat
This is the easiest method for most normal wrinkles and fold lines.
It requires no special tools. Dampening makes the cotton-linen canvas easier to reshape, while even pressure keeps the affected area flat as it settles.
What You Need
- Clean water
- A clean, flat surface
- A large book, flat board or another smooth, heavy object
How to Do It
-
Lay the canvas flat.
Place the unpainted canvas on a clean, smooth surface. -
Dampen the crease.
Apply clean water to the wrinkled or folded area. The affected section should be properly damp, but there is no need to wet the entire canvas. -
Smooth the area flat.
Gently position the canvas so the crease is lying as flat as possible. Do not rub or scrub the printed surface. -
Apply even pressure.
Place a flat, heavy object over the affected area. A large book or flat board works well. If necessary, place a clean, smooth barrier between the damp canvas and the object. -
Leave it for at least 12 hours.
Keep the canvas flat under pressure. Deeper creases can simply be left for longer. - Remove the weight and allow the canvas to finish drying if necessary.
For most local creases caused during shipping or storage, this method is usually enough.
If an obvious fold line remains and you want a faster or stronger treatment, move to Method 2.
Method 2: Iron the Back of the Canvas
Ironing is the quickest method for a deeper crease or when you do not want to wait overnight.
A steam iron is preferred because gentle moisture and heat work well together on cotton-linen fabric, but the canvas does not require high heat.
How to Iron a Paint by Numbers Canvas
-
Prepare a clean ironing surface.
Place a clean towel on an ironing board or another flat, heat-resistant surface. -
Lay the canvas printed side down.
The blank back of the canvas should face upwards. -
Cover the back with a clean cloth.
Use a clean cotton tea towel, pillowcase or similar thin cloth between the iron and the canvas. -
Set the iron to low heat.
Start with a low setting rather than a high cotton or linen setting. -
Use light steam.
If you are using a steam iron, a small amount of steam is enough. There is no need to saturate the canvas with steam. -
Keep the iron moving.
Move it gently over the creased area. Do not leave the iron stationary in one place. -
Check the result regularly.
Once the crease has flattened, stop applying heat. - Lay the canvas flat while it cools.
The important rule is simple: work from the back of the canvas and never place a hot iron directly on the printed front.
If you do not have a steam iron, you can lightly dampen the creased area first and use a normal iron on low heat through a protective cloth. This is still the ironing method: the water is only used to assist the heat, so there is no need to press the dampened canvas under a heavy object for 12 hours first.
Method 3: Fully Wet the Canvas and Let It Dry Flat
For several strong creases or widespread wrinkling, the simplest solution can be to reset the entire canvas rather than treating each crease separately.
This is the method recommended by our production team for stubborn creasing on the unpainted cotton-linen blend canvas used in Paintarthub kits.
It may sound more aggressive than the first two methods, but cotton-linen canvas is highly flexible when wet and can be reshaped easily as it dries.
How to Do It
- Fill a clean sink, basin or container with clean water.
- Place the entire unpainted canvas into the water until it is completely wet.
- Do not rub, scrub, twist or wring the canvas.
- Lift the canvas carefully and allow excess water to drain away.
- Spread the canvas completely flat on a clean, smooth surface.
- Gently straighten the edges and corners so the canvas is lying in its normal shape.
- Leave it flat and allow it to air-dry naturally.
- Begin painting only after the canvas is completely dry.
This method is most useful when the canvas has several fold lines, a large wrinkled area, or a crease that has not responded well enough to local treatment.
For one small crease, Method 1 or Method 2 is normally more convenient.
What If a Slight Crease Is Still Visible?
You do not need to make an unpainted canvas perfectly flat before you can start painting.
If only a very faint surface line remains and the canvas already lies flat enough to paint comfortably, it can normally be left alone.
Once acrylic paint has been applied and dried, very small surface irregularities usually become much less noticeable and do not affect the appearance of the finished painting. Stretching the completed canvas onto a wooden stretcher frame also keeps it flat and taut.
A crease should therefore be treated when it noticeably raises the painting surface or makes the canvas difficult to work on—not simply because a faint line can still be seen when examining the blank canvas closely.
For stretching and framing after painting, see How to Frame a Paint by Numbers Canvas with a DIY Wooden Frame?
How to Prevent New Creases
Once the canvas has been flattened, a few simple storage habits can prevent the same problem from returning:
- Roll the canvas rather than folding it.
- Avoid placing uneven or sharp pressure on the stored canvas.
- Store it somewhere clean and dry until you are ready to paint.
- If you are working on the painting over several days, keep the canvas flat or secured to a flat board between painting sessions.
For the full painting process, see How to Paint by Numbers: A Step-by-Step Guide for Beginners .
Frequently Asked Questions
What should I do if pressing the crease for 12 hours is not enough?
If a visible crease remains, you can leave it under pressure for longer or move to the low-heat ironing method. If there are several strong creases across the canvas, fully wetting and drying the canvas flat is usually more convenient than treating each one separately.
Do I need a steam iron?
No. A steam iron is convenient, but it is not essential.
If you only have a normal iron, lightly dampen the crease first, place the canvas printed side down, cover the back with a clean cloth and iron it gently on low heat. The dampening here is only an aid to ironing and does not require the 12-hour pressing step used in Method 1.
Do I need anything other than water?
No. Clean water is all you need.
There is no need to add detergent, fabric softener or any other product when dampening or soaking the canvas.
Can I use these methods on any paint by numbers canvas?
Not necessarily.
These instructions are based on the unpainted cotton-linen blend canvas used in Paintarthub paint by numbers kits. Other brands may use different fabrics, coatings or printing processes, so their care instructions can differ.
