If your paint by numbers paint has dried up, check its texture before throwing it away. Thick or partially dried acrylic paint can often be restored, but solid, rubbery, or cracked paint usually needs to be replaced.
The safest method is to add a very small amount of clean water, mix the paint thoroughly, and test it before adding more. Too much water can make the paint transparent and reduce its ability to cover the printed numbers and lines.
Quick Fix: Try This First
If the paint is thick but still soft:
- Add one drop of clean, room-temperature water.
- Mix slowly with a toothpick or a small clean spatula.
- Wait one or two minutes.
- Mix again and check the consistency.
- Test the paint on a small section of the canvas.
If the paint is still too thick, add one more drop and repeat the process. Small paint pots need very little water, so never pour water directly into the container.
The paint should spread smoothly from the brush without running outside the numbered area. If it becomes watery or transparent, stop adding water and let it sit with the lid closed before testing it again.
If the paint no longer covers the printed details properly, follow our guide to covering paint by numbers lines and numbers.
Why Paint by Numbers Paint Dries Up
Air Entering the Paint Pot
Acrylic paint begins to lose moisture when air enters the container. This often happens when the lid is not fully closed or dried paint around the rim prevents a tight seal.
Even a small opening can gradually make the paint thicker.
Heat and Direct Sunlight
Warm storage areas and direct sunlight increase evaporation. Paint pots should not be stored near windows, radiators, heaters, or other sources of heat.
Long Breaks Between Painting Sessions
Paint can also thicken when a kit remains unused for a long time. The exact speed depends on the seal, storage conditions, amount of paint, and air left inside each pot.
Different colors may thicken at different rates because the amount of paint and air inside each container can vary.
Can Dried Acrylic Paint Be Restored?
The texture of the paint usually shows whether it can still be saved.
Thick but Smooth Paint
Paint that is thick but still smooth can usually be restored. Add one drop of water, mix thoroughly, and test it before adding more.
Soft Paint With Small Lumps
Partially dried paint may contain soft lumps. Mix it slowly and check whether the lumps break apart.
If hard pieces remain in the paint, remove them before painting. Otherwise, they may leave raised marks or drag across the canvas.
Rubbery Paint
Rubbery paint has already lost much of its original structure. Adding water may make the outside softer, but it usually will not return the paint to an even, usable consistency.
Replacement is normally the better option.
Fully Hardened or Cracked Paint
Solid, cracked, or completely hardened acrylic paint cannot be rehydrated. Once the acrylic binder has cured, water will not return it to its original state.
If the paint becomes watery but still contains hard pieces or separated pigment, it has broken down too far and should be replaced.
Should You Use Acrylic Medium or Flow Improver?
Clean water is usually enough for paint that is only slightly thick. Add it one drop at a time and test the paint before making further adjustments.
A small amount of acrylic medium may help thin the paint while preserving more of its binding properties. It can be useful when water alone makes the paint too transparent.
Flow improver is designed to help acrylic paint move more smoothly from the brush. It may improve application, but it cannot restore paint that has already become solid, rubbery, or fully cured.
Use any medium sparingly because paint by numbers pots contain only a small amount of paint.
How to Prevent Paint From Drying Out
- Open only the color you are currently using.
- Close the lid immediately after loading the brush.
- Press around the lid until it is fully sealed.
- Remove dried paint from the rim of the pot.
- Keep the containers upright.
- Store the kit away from heat and direct sunlight.
- Avoid leaving paint pots open while working on another section.
- Clean brushes before switching to a new color.
Good working habits also reduce wasted paint. More practical advice is included in our paint by numbers tips.
When to Replace the Paint
Replace the paint if it is:
- completely solid;
- rubbery;
- cracked;
- filled with hard pieces;
- separated into watery liquid and solid pigment;
- unable to cover the canvas after careful mixing.
Continuing to add water will not restore fully cured acrylic paint. It can instead create a weak, streaky mixture that does not adhere or cover properly.
How to Request Replacement Paint
Note the number printed on the affected paint pot and take a clear photo of the paint and canvas. Contact the seller with:
- your order number;
- the paint color number;
- a photo of the affected paint;
- the name of the design.
This information helps the seller identify the correct replacement shade so you can continue the same painting.
Summary
Thick paint by numbers paint can often be restored if it is still soft and contains some moisture. Add clean water one drop at a time, mix thoroughly, and test the paint before adding more.
Soft or slightly clumpy paint may still be usable, but rubbery, cracked, or fully hardened acrylic paint should be replaced. Keeping the paint pots clean, tightly closed, upright, and away from heat is the best way to prevent the problem from happening again.
