The quick-start workflow

Using watercolor brush pens is intuitive: pick up a pen, write or draw, touch with a water brush to blend, let dry. With five minutes of practice you'll have the rhythm.

Here's the short version. Detailed sections below.

1. Swatch every color on a corner of your paper. See the actual shade; test the flow.
2. Start with the lightest color in your composition. Watercolor is built light to dark.
3. Lay down a stroke with a colored brush pen.
4. Touch the stroke with a clean, wet water brush. Pigment spreads, softens, blends.
5. Let it dry fully before adding another layer (2–5 minutes on 300gsm paper).
6. Add darker or contrasting colors on top once dry, softening edges with the water brush again as needed.
7. Blot the water brush on scrap paper between colors to keep it clean.

Swatch and experiment

The first thing to do with a new set of watercolor brush pens is swatch every color on a strip of your actual paper.

What's more exciting than buying new brush pens? Swatching them! This lets you see the actual colors and how they perform on different textures and weights of paper. Take it to the next level by dipping the brushes in water — this will dilute the ink and give you even more shades to play with.

Why swatching matters: the color printed on the pen barrel is an approximation. The actual on-paper color varies with your specific paper's absorbency, the pen's ink load, and how many strokes you make. A swatch strip built on your actual paper is the only way to know what you're really working with.

Simple swatching workflow:

1. Write the color number on the paper next to where you'll swatch it
2. Make 3 passes: one light stroke, one medium, one heavy-pressure stroke
3. Do a 4th pass with a water brush touching the swatch to see the water-blended shade
4. Save the swatch strip as your permanent color reference card

Chalkola's 28-color set ships with a 15-sheet 300gsm pad — use the first sheet as your dedicated swatch reference. The paper is matched to the pens, so your swatches will be accurate.

Don't forget the water brush

The water brush is what makes a brush pen "watercolor." Without it, you have a vivid colored pen. With it, you have a full watercolor-blend capability.

Water brushes work just like a traditional brush, except they have a reservoir inside that you can fill with water. You can use them to blend colors that you've already applied or mix two different colors on a palette. Moving onto a different shade? Blot the water brush onto a scrap piece of paper to make sure that it's clean and free of color.

How to fill a Chalkola water brush:

1. Unscrew the barrel from the brush tip (gentle — these screw-thread together)
2. Fill the barrel about 80% with clean water. Don't overfill or it leaks
3. Screw the brush tip back on. It should feel snug, not tight
4. Gently squeeze the barrel 1–2 times over a scrap of paper to prime water through the nib
5. You're ready. Light squeezes release more water; lighter pressure on the nib releases less

Three techniques with the water brush:

• Blend after applying: lay a stroke with the colored pen, then touch with a wet water brush to soften the edge or create a gradient.
• Pick up color directly from the pen tip: touch the water brush nib to a colored pen tip. The water brush picks up pigment; you can paint with the water brush like a mini-loaded paintbrush. Great for producing very pale wash shades.
• Activate dried ink: if a dried brush pen ink won't flow, tap it with a wet water brush to rehydrate enough pigment to keep working.

Keep the water brush clean between colors. Blot on a scrap of paper or paper towel. A dirty water brush muddies subsequent colors.

Use heavyweight paper

Watercolor brush pens need heavyweight, absorbent paper. Office paper and standard sketchbooks will buckle, warp, and pill when water hits them.

Using office paper may seem like a good idea, but only if you're sketching or testing colors out. For watercolor brush pens (and watercolor painting in general), you want to use thick paper that won't buckle or warp. For beginners, 300 gsm is ideal — but if you do plenty of layers and washes, you'll want to go with something heavier.

Weight guide (gsm = grams per square meter, lb = pound rating):

• 200 lb / 300 gsm — the baseline for watercolor brush pens. Handles 2–3 water-blend passes without buckling. The paper that ships with Chalkola's 28-pack is 200lb / 300gsm, acid-free, fine textured.
• 140 lb / 200 gsm — lighter watercolor paper. Works for quick sketches and single-layer work. May buckle slightly with heavy wet-on-wet technique.
• 300 lb / 640 gsm — archival-weight paper for advanced layering and heavy wash. No buckling at all. Overkill for most brush pen use but worth it for finished pieces.
• Mixed media journal / 250 gsm — popular for bullet journaling and sketchbook work. Handles brush pen color with 1 water pass. Convenient for on-the-go work.

What to avoid: copy paper, standard sketchbook paper, regular notebook paper. These all buckle, warp, and tear under watercolor brush pen ink. Full paper guide: best paper for watercolor brush pens.

Mix and blend colors

Watercolor brush pens give you three distinct blending methods, each producing a different look.

There are many ways to blend colors with watercolor brush pens. You can (1) paint directly on the paper and blend with a water brush; (2) rub paint onto a palette and mix with a clean brush, or (3) touch the tips of two markers together for a gradient effect. Each method has its pros, so try them all out to find what works best for your project!

Method 1 — Paint then blend on paper

Lay down two adjacent strokes with different colored pens. While both are still wet, touch a wet water brush at the seam between them. The water reactivates both inks and bleeds them into each other. Best for gradient sky washes, sunset transitions, abstract color fields.

Method 2 — Mix on a palette

Tap a colored pen against a non-porous palette (a ceramic tile, a plastic lid, or a real mixing palette). This deposits a small puddle of pure pigment. Repeat with another color. Use a clean water brush to pick up and mix the pigments. Best for when you want a specific custom shade or need to produce a pale wash.

Method 3 — Tip-to-tip gradient

Touch the tip of a lighter-colored pen against the tip of a darker-colored pen. The lighter tip picks up some of the darker pigment. Now draw — your stroke starts darker and transitions to lighter as you drag. Best for lettering (ombre effect in a single letter) and small illustrated details.

Clean tips after tip-to-tip blending: gently blot the contaminated tip on a scrap of paper until it's running true color again (3–5 strokes usually does it).

Use the right amount of pressure

Pressure control is where the "brush" in "brush pen" becomes real. The same pen creates thin hairlines and thick wide strokes depending on how hard you press.

Watercolor markers can be used in many different ways to achieve specific effects. Use a light hand to create thin, dainty lines or add more pressure for a thicker stroke. You can also hold the brush at a near-horizontal angle. This lets you paint a bigger area at once, perfect for filling in large shapes or creating backgrounds.

Three pressure levels

• Feather-light (1 mm stroke): the nib tip barely touches the paper. Best for delicate line work, fine details, lettering upstrokes.
• Medium (2–3 mm stroke): moderate pressure engages more of the nib. Best for everyday drawing and writing.
• Heavy (4–6 mm stroke): firm pressure fans the nylon brush hair. Best for filling shapes, lettering downstrokes, bold color.

Holding angle

• Vertical grip (pen held like a pencil): gives you the thinnest line possible. Used for lettering upstrokes, small-detail drawing, eye details in portraits.
• 45-degree angle: the default, everyday grip. Comfortable for most drawing and writing.
• Near-horizontal: hold the pen nearly flat against the paper. Uses the side of the nib for the widest possible stroke. Ideal for filling backgrounds, laying washes, or painting loose shapes.

Speed and ink flow

Slower strokes deposit more ink. Faster strokes deposit less. If you find a stroke is too pale, slow down. If it's depositing too much and bleeding, speed up. This is muscle memory; after 30–45 minutes of practice, it becomes unconscious.

Build layers — light to dark

Watercolor is built light-to-dark. Once a dark color is down, you can't lift it back to light. Start with your lightest wash and work progressively darker.

Layering workflow:

1. Identify your lightest color in the composition (usually a pale sky, a light skin tone, or a soft background wash)
2. Lay that color first, softening with a water brush to create a flat wash
3. Wait until fully dry — 3–5 minutes on 300gsm paper, touch-dry test with a clean dry finger
4. Apply next-lightest shade on top, leaving the lighter wash visible in highlight areas
5. Let dry again
6. Continue to darker and darker shades until you reach your deepest shadow tones
7. Add small dark accents last — nib tip, no water, pure pigment. These are your "pop" details.

Patience is the hardest part. Moving too fast between layers causes the underlying layer to rehydrate and lift — you lose the clean edges. Set a 3-minute timer; wait it out.

Troubleshooting common layer issues

• Layer is lifting when I add the next one: underlying layer wasn't fully dry. Wait 2 more minutes and re-test.
• Colors are going muddy: you're adding complementary colors (red on green, orange on blue) on top of each other. Complementary colors gray down. Use analogous colors (adjacent on the color wheel) for cleaner layering.
• Paper is pilling under the brush: paper weight too low. Move to 300gsm. See paper guide.

How to fix common mistakes

Too much ink in one spot

Immediately touch with a clean, dry water brush to pull pigment into surrounding dry area. If already dried: dab a damp corner of a paper towel against the spot to lift some pigment.

Wrong color in the wrong place

While still wet, dab with a clean water brush to lift as much pigment as possible. Expect some staining to remain — consider incorporating it into the composition (leaves, shadows, etc.). Fully-dried mistakes are permanent.

Unwanted hard edges

Hard edges form when a wash dries. To soften: touch a clean wet water brush to the edge and drag pigment outward. Works best within 30 seconds of the original stroke.

Paper buckling mid-painting

Paper buckle often settles flat on its own after drying 24 hours. If it doesn't: stretch the paper by running the dry back side under a thin stream of cool water, laying flat to dry under a weighted book overnight. Or simply switch to heavier (300gsm+) paper next time.

Brush pen won't flow

Remove cap, touch nib to a wet water brush for 10 seconds. This rehydrates the ink near the nib. If the pen has been capless for hours, tap the ink chamber against a flat surface to re-settle pigment. Persistent dry pens may be nearing end-of-life.

Frequently asked questions

Continue reading