Quick answer: Golden High Flow is an ink-consistency acrylic that is meant to be used straight from the bottle, not thinned with water first. Shake it, dispense a small amount into a palette well or directly into a refillable marker, dip pen, airbrush, or brush, and apply it in thin passes on a primed or absorbent surface. Dilute only for lighter washes, and use Golden’s Airbrush Medium rather than plain water so the binder stays intact.
Learning how to use Golden High Flow acrylic paint starts with understanding what it is not: it is not a heavy body paint that has been watered down. The pigment load is set for a very thin binder, so the color stays strong even when it flows like ink. That single fact changes how you load a brush, how you layer, and which tools suddenly become available to you.
This guide walks through the full process in order, from preparing the bottle to sealing the finished piece. It covers brushwork, lining with dip pens, filling empty markers, airbrushing, and pouring, with the ratios and timings that keep the paint behaving. If you are still deciding whether this line belongs in your kit at all, the overview of Golden’s acrylic paint range and what each formula does best covers how High Flow sits next to Fluid, Heavy Body, and OPEN.
What makes High Flow different from other Golden acrylics
Golden sells several acrylic consistencies, and they are built from the same pigment families but different binder formulations. Heavy Body holds a peak. Fluid pours like heavy cream. High Flow is the thinnest of the group, closer to drawing ink than to paint, and it is formulated so the binder does not break down at that viscosity.
The practical results are these:
- It levels almost completely, so brush marks disappear unless you want them.
- It dries to a satin-to-matte film that accepts more layers without lifting.
- It can pass through fine nozzles (airbrush, technical pens, 1 mm marker nibs) without clogging the way thinned heavy body paint will.
- Transparent and opaque pigments behave very differently in this format. Quinacridones and phthalos stay glowing and transparent; titanium white and the cadmium hues are opaque enough to cover.
Because the paint is already at working viscosity, the usual acrylic habit of “add water until it moves” is the most common mistake people make with it. Water beyond roughly 20 to 25 percent by volume starts to dilute the binder enough that adhesion suffers, especially on slick surfaces.
Materials you need before you start
You can begin with a single bottle and a brush, but the following list covers the tools that unlock the paint’s full range.
- High Flow bottles in the colors you plan to use. The 1 oz size is enough for lining and marker work; 4 oz is better for washes and pouring.
- A palette with wells or a ceramic plate. Flat palettes let ink-thin paint run together.
- Soft synthetic brushes (round and flat) in sizes 2 through 10. Natural hair soaks up too much of a thin paint and releases it unevenly.
- A dip pen holder with nibs, or a refillable brush pen.
- Empty refillable markers with replaceable nibs if you want marker work.
- Golden Airbrush Medium or a general acrylic flow medium for dilution.
- A spray bottle for misting the palette to slow drying.
- Surfaces: primed canvas, gessoed panel, mixed media paper (at least 300 gsm), or Yupo for fluid effects.
- Paper towel, two water jars, and a small funnel for filling markers and airbrush cups.
How to use Golden High Flow acrylic paint step by step
Step 1: Shake the bottle thoroughly
Thin acrylics separate faster than thick ones. Pigment settles toward the bottom and a clear or cloudy binder layer sits on top. Shake each bottle for 20 to 30 seconds before every session, and give it another short shake if the bottle has sat for more than an hour. If you dispense a color that looks milky or weak, the pigment has not been mixed back in.
Step 2: Prepare the surface
High Flow sinks into absorbent surfaces and sits on top of sealed ones, and each behavior is useful if you plan for it.
- On gessoed canvas or panel, the paint spreads slightly and dries fast. Two coats of gesso, lightly sanded, give the most predictable line.
- On mixed media or watercolor paper, it stains like ink and cannot be lifted once dry. Tape the sheet down so it does not buckle under washes.
- On Yupo or sealed surfaces, the paint pools and can be pushed around with a brush, a straw, or a palette knife until it begins to set.
- On fabric, pre-wash the fabric to remove sizing, and test absorbency on a scrap first.
Step 3: Dispense small amounts
Squeeze five to ten drops into a palette well. That sounds stingy, but the paint goes a long way at this consistency, and a well that is too full skins over before you use it. Keep the cap on the bottle between pours; a bottle left open for an afternoon will thicken at the neck.
Step 4: Load the brush correctly
Dip only the first third of the bristles into the paint, then touch the tip to the rim of the well to release the excess. A fully loaded brush will drip and leave a bead at the start of every stroke. For long, even lines, reload often rather than pressing harder as the brush empties.
Step 5: Apply in thin, confident passes
Because the paint levels, hesitation shows as blobs where the brush paused. Plan the stroke, commit, and lift cleanly at the end. For broad areas, work in one direction with a flat brush and let each pass overlap the previous by a third. Two thin coats always look better than one heavy one.
Step 6: Let each layer dry before glazing
High Flow is touch-dry in about 5 to 15 minutes on absorbent surfaces and 15 to 30 minutes on sealed ones, depending on humidity. Wait until the sheen looks even before painting over it. If you paint into a layer that is still tacky, the second color will bleed into the first and lift pigment.
Step 7: Clean tools immediately
Rinse brushes in the first water jar, then the second. Dried High Flow is as permanent as any acrylic, and the thin paint climbs higher into the ferrule than thick paint does. Nibs and marker parts should be rinsed under running water and dried before reassembly.
Diluting High Flow: when and how much
You rarely need to dilute, but there are three situations where it makes sense: light tinted washes, staining large areas, and matching the viscosity an airbrush wants at low pressure.
| Goal | Diluent | Approximate ratio (paint : diluent) | Notes |
|---|---|---|---|
| Slightly softer wash on paper | Water | 4 : 1 | Safe range; adhesion unaffected on absorbent surfaces. |
| Pale glaze on canvas | Airbrush Medium or glazing medium | 1 : 1 to 1 : 3 | Keeps binder strong; glaze stays flexible. |
| Airbrush at 15–25 psi | Airbrush Medium | 1 : 1 | Add more medium if the nozzle spits. |
| Transparent stain on raw fabric | Water plus a few drops of flow improver | 1 : 1 | Heat-set after drying for wash durability. |
| Pouring or dripping | Pouring medium | 1 : 2 to 1 : 4 | Thin paint tints the medium strongly; start light. |
A useful check: if a diluted mix dries with a chalky look or rubs off a sealed surface with a damp finger, you added too much water. Switch to medium for the next batch.
Lining and drawing with dip pens
This is where High Flow earns its reputation. The paint is pigmented rather than dye-based, so lines are lightfast, waterproof once cured, and available in colors that traditional drawing inks do not offer, including interference and iridescent shades.
- Pour a few drops into a shallow dish rather than dipping into the bottle.
- Load a flexible nib by dipping it just past the vent hole. Wipe the back of the nib on the dish edge.
- Draw with light pressure. The paint flows slightly faster than India ink, so start with quicker strokes than you would normally use.
- Rinse the nib every few minutes. Acrylic cures on metal quickly, and a nib with dried paint in the slit will skip.
- Let linework dry 10 minutes before laying washes over it. Once dry it will not bleed under water-based layers.
For brush lettering, a pointed synthetic round or a refillable water brush filled with High Flow gives a line that thins and swells cleanly. Flush the water brush after every session or the mechanism will seize.
Filling refillable markers
Empty paint markers are sold with porous nibs and a reservoir body. High Flow is one of the few artist acrylics that works in them without further thinning.
- Choose a marker with a replaceable nib. Nibs eventually stiffen with acrylic and are easier to swap than to clean.
- Shake the paint bottle, then use a small funnel or a pipette to fill the barrel about three-quarters full. Leave air space so the paint can move.
- Insert the nib and cap the marker. Let it stand nib-down for 20 to 30 minutes to saturate.
- Prime on scrap paper with short dabs rather than long strokes until color flows evenly.
- Store markers horizontally. Nib-down storage floods the tip; nib-up starves it.
If a marker begins to drag after a few sessions, pull the nib, rinse it, and add a drop or two of Airbrush Medium to the reservoir. Do not add water directly to a marker body; it separates from the paint and causes watery blotches at the start of each stroke.
Airbrushing with High Flow
Golden formulates High Flow to be airbrush-ready, which means it can be sprayed unthinned through a 0.3 mm to 0.5 mm nozzle at moderate pressure. Even so, a little medium makes it more forgiving.
- Pressure: start around 20 to 25 psi for general coverage; drop to 12 to 15 psi for fine detail, adding medium so the paint still atomizes.
- Nozzle care: acrylic dries inside the needle cap between sprays. Back-flush with cleaner every 10 to 15 minutes of use and wipe the needle tip.
- Surface prep: a matte gessoed surface grips sprayed acrylic far better than a glossy one. On slick plastics, use an acrylic primer first.
- Layering: apply transparent colors in several light passes. Each pass dries in seconds, so you can build gradients without waiting.
Always spray in a ventilated area with a respirator rated for particulates. Acrylic mist is not solvent-based, but any airborne pigment should stay out of your lungs.
Pouring, dripping, and marbling
Because High Flow is so thin, it tints pouring medium much more aggressively than heavy body paint. A teaspoon of High Flow in a quarter cup of medium gives a fully saturated color. Start with less than you think you need.
For a controlled drip effect on a vertical canvas, use the paint undiluted from a pipette. It will run in a narrow, even track. For marbled surfaces, float a few drops on a shallow tray of thickened water or a methylcellulose size, swirl once, and lay paper on top for two seconds. The pigment transfers crisply because the particles are fine and evenly dispersed.
Layering, glazing, and mixing with other Golden paints
All Golden acrylic lines share the same chemistry, so High Flow mixes safely into Fluid, Heavy Body, and OPEN. A few drops of High Flow can tint a large amount of clear gel or gloss medium. Adding Heavy Body to High Flow thickens it, but you lose the self-leveling quality quickly, so add paste rather than the other way around if you want a specific viscosity.
Glazing is one of the strongest uses. A transparent High Flow color brushed over a dry underpainting shifts the hue without hiding the drawing beneath. Phthalo blue (green shade), quinacridone magenta, and transparent pyrrole orange are especially effective as glazes. Opaque colors like titanium white or carbon black will cover rather than glaze, so thin them with medium if you want a veil instead of a block.
If you are comparing this behavior with the slow-drying OPEN line, the separate write-up on whether Golden OPEN acrylics suit your way of working explains how the extended drying time changes blending options.
Common mistakes and how to fix them
| Problem | Likely cause | Fix |
|---|---|---|
| Color looks weak or streaky | Bottle not shaken; pigment settled | Shake 30 seconds; discard the first few drops |
| Paint beads up on canvas | Surface too glossy or greasy | Wipe with isopropyl alcohol or add a matte gesso coat |
| Lines blob at start of stroke | Overloaded brush or nib | Touch off excess on the well rim before each stroke |
| Layer lifts when painted over | Previous layer not fully dry | Wait until sheen is uniform, 15–30 minutes |
| Chalky dried film | Too much water added | Use medium for dilution; keep water under 25% |
| Marker skips or dries out | Nib clogged or stored nib-down | Rinse nib, add drop of medium, store flat |
| Airbrush spits | Tip dry or paint too thick for pressure | Clean needle tip; add medium 1:1 |
Sealing and finishing a High Flow painting
High Flow dries to a slightly lower sheen than Heavy Body, and transparent colors can look uneven in gloss between thick and thin areas. An isolation coat evens that out before varnishing.
- Wait at least 72 hours after the final layer. The film is touch-dry in minutes but needs days to cure fully.
- Brush on a thin isolation coat of soft gel gloss diluted with water (about 2 parts gel to 1 part water). Let it dry 24 hours.
- Apply a removable varnish in the sheen you want. Two thin coats are better than one thick one.
- Works on paper can be sprayed with an archival acrylic spray varnish instead, in two or three light coats.
Marker and pen work on paper destined for framing under glass does not strictly need varnish, but a UV-protective spray adds insurance for fluorescent and some less lightfast pigments.
Tips by skill level
Beginners
Start with three transparent colors and one opaque white on mixed media paper. Practice drawing lines with a brush before buying nibs or markers. Get used to how fast the paint dries and how far a few drops go.
Intermediate painters
Use High Flow for the underdrawing and first transparent washes of a canvas painting, then switch to Fluid or Heavy Body for the opaque passages. Fill a couple of markers for line work in sketchbooks.
Advanced users
Explore airbrush gradients over masked shapes, iridescent High Flow glazes over dark grounds, and combining High Flow with clear tar gel for string-like drizzled lines. Pay attention to pigment transparency charts; the paint’s thinness makes transparency differences far more visible than in heavier formats.
FAQs
Do you need to add water to Golden High Flow?
No. It is formulated to be used straight from the bottle. Add water only for lighter washes, and keep it under about a quarter of the total volume. For stronger dilution, use Airbrush Medium or another acrylic medium so the paint film stays sound.
Can Golden High Flow be used in fountain pens?
It is not recommended. Acrylic cures permanently inside the feed and will ruin the pen if it sits. Dip pens, refillable markers, and water brushes that can be fully flushed are the safe options.
Is High Flow the same as acrylic ink?
Functionally they are very close. Both are thin, pigmented acrylic emulsions. Golden markets High Flow as paint rather than ink, and its range includes interference, iridescent, and fluorescent colors that most ink lines do not offer.
How long does High Flow take to dry?
On absorbent surfaces, roughly 5 to 15 minutes to the touch. On sealed or non-porous surfaces, 15 to 30 minutes. Full cure for varnishing takes about three days, longer in cold or humid rooms.
Can you mix High Flow with Golden Heavy Body?
Yes. All Golden acrylic lines are compatible. Add the thin paint to the thick paint gradually to control the final viscosity, since High Flow loosens heavy body paint very quickly.
Is High Flow waterproof when dry?
Once fully cured, yes. It will not reactivate with water, which is why dried paint in brushes, nibs, and markers must be prevented rather than cleaned later.
Next Step
High Flow works best when you stop treating it like watered-down paint and start treating it like a pigmented ink that happens to bond like acrylic. Shake it, use it thin, dilute with medium rather than water, and clean tools as you go. Those four habits cover most of what separates frustrating results from clean ones.
If you want to see how it fits alongside the Fluid, Heavy Body, and OPEN formulas, and which colors are worth picking up first, the guide to choosing the right Golden acrylic consistency for your work lays out the whole family side by side. For a closer look at the slow-drying option in particular, the in-depth Golden OPEN review covers where that line shines and where it does not.
