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Are Posca Pens Waterproof or Not? – Facts

Written by Robert S. Brown / Fact checked by Helen B. Harris

are posca pens waterproof

The secret behind Posca pens’ worldwide fame lies in their unparalleled effectiveness and permanency. But amidst the acclaim, many still wonder: Are Posca pens waterproof?

Generally speaking, yes. Sifting through their formulation, the waterproofing and quick-drying properties are results of Posca pens’ water-based ink. The pigment becomes waterproof once it dries.

In this article, we are going to talk more about the qualities of Posca pens and how their waterproofing properties help safeguard your creative projects for years to come.

What Makes Posca Pens Waterproof?


Posca pens stand out because of their exquisite formulation.

Crafted in Japan with premium water-based acrylic paint ink, these pens steer clear of harmful solvents and alcohol, instead opting for water as a crucial component. This characteristic makes them both washable and blendable.

As the ink dries, a remarkable transformation occurs, rendering Posca pens completely waterproof on porous surfaces, ready to withstand the test of time and the elements.

From paper to metal, Posca’s ink clings tenaciously to a diverse range of surfaces, promising vibrant, long-lasting masterpieces without the need for additional fixatives.

On non-porous mediums, however, the ink requires a varnish coating to remain unerasable.

How to Test if a Posca Pen is Waterproof

Testing the waterproof capabilities of a Posca pen is essential to ensure the durability and resilience of your artwork, particularly when it may encounter moisture or rain.

Follow this comprehensive step-by-step guide to determine if your Posca pen is truly waterproof:

1. Select Your Testing Surface


Choose the surface you intend to use for your artwork. Whether it’s paper, cardboard, metal, plastic, or any other compatible material, make sure it accurately represents your usual canvas.

2. Prepare Your Test Swatch


Create a small test swatch or draw a line using the Posca pen on the chosen surface. Allow the ink to dry completely before proceeding with the test.

3. Identify the Pen’s Composition

Check the pen’s label or packaging for any indications of being waterproof or containing pigments.

Pigmented inks are generally water-resistant as they contain tiny colored particles that do not dissolve in water, ensuring the longevity of your artwork.

4. Conduct a Water Test


Gently wet a clean brush or sponge and lightly brush over the test swatch. Alternatively, you can submerge the test swatch in a shallow container of water for a brief moment.

5. Observe the Results

If the Posca ink remains intact and shows no signs of smudging or running, congratulations! The pen is indeed waterproof, granting your artwork protection from water-related mishaps.

However, if the ink smears or bleeds upon contact with liquids, it may not be entirely waterproof.

Can Posca Pens Be Used on Wet Surfaces?

For optimal results, ensure the surface is entirely clean and dry before applying the vivid hues of Posca pens. Attempting to use these pens on wet surfaces may lead to undesired results, as the ink could become diluted, smudged, or may not adhere properly.

Frequently Asked Questions

Do Posca Markers Use Permanent Ink?

Are Posca markers permanent? Yes, they are.

Posca pens boast impressive permanency, making them a reliable choice for your artistic endeavors. These water-based markers utilize stable pigments, allowing them to leave a lasting impression on various materials.

You can apply Posca pens on fabric, pebbles, plastics, metals, and cardboard. You can even use these markers on glass and other non-porous surfaces. Posca’s ink adheres firmly to these without problems.

Related: Posca Markers Review

Can You Customize Your Car Using Posca Pens?

Certainly! With Posca pens, you can personalize your car with your preferred colors or decorations. Just make sure to keep the surface clean and dry before using the pen.

Once you’re satisfied with your design, protect it by applying a water-based aerosol varnish for long-lasting vibrancy.


The exquisite formulation of premium water-based acrylic paint ink makes Posca pens a definitive option for artists seeking enduring creations. Their quick-drying nature allows for the seamless blending of strokes, and they adhere tenaciously to a plethora of surfaces.

From paper to metal, Posca’s waterproof ink ensures vibrant and long-lasting masterpieces for display.

So again, are Posca pens waterproof? Absolutely, and they stand out as a dependable and versatile choice in the world of waterproof artistry.

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