How to Use Liquin Medium in Oil Painting: Ratios and Tips

Liquin has a reputation as the medium that makes oil paint behave on a schedule. Paint that would normally stay wet for days can be dry enough to glaze over by the next morning, and brushstrokes level into smoother passages. But painters who squeeze a generous puddle onto their palette often find it turning gummy within the hour, or end up with glossy patches they did not want. Learning how to use Liquin medium in oil painting is mostly about quantity, timing and where in the layer sequence you use it.

What Liquin Is and What It Does

Liquin is the brand name of a family of alkyd painting mediums made for oil paint. Alkyds are synthetic resins modified with oil, and they cure through the same oxidation process as linseed oil, only faster. Mixed into oil paint, the original Liquin formula:

• Speeds drying, so thin layers often dry overnight.
• Improves flow and makes brushstrokes smoother.
• Increases transparency, which helps glazes.
• Raises gloss in the dried film.
• Produces a flexible film that tends to resist yellowing better than heavy linseed oil additions.

It is a gel-like liquid with a mild solvent odor. The line has included several versions over the years, each changing the consistency for a different job.

Product lines change over time, so check what is currently available. If you are deciding which version suits your style, our comparison of the best Liquin medium options for oil painting covers how they differ in flow, drying and finish.

How to Use Liquin Medium in Oil Painting: Basic Method

1. Set up ventilation. Liquin contains a petroleum solvent. Open a window or use an extractor fan.
2. Squeeze a small amount. A pea- to grape-sized blob is plenty for a session of small to medium work. You can always add more.
3. Mix into paint with a palette knife. Start with a ratio of roughly one part Liquin to five to nine parts paint. Fold it through until the paint looks uniform.
4. Test the feel. Brush a stroke on the edge of your palette or on a scrap. If you want more flow or transparency, add a little more Liquin.
5. Paint the passage. Work steadily; the mix will start to stiffen on the palette within roughly 30 to 60 minutes depending on temperature.
6. Refresh as needed. Mix new batches rather than reviving tacky paint with solvent.
7. Let it dry. Thin layers are commonly touch-dry within about 24 hours, sometimes less in warm, airy rooms. Thicker strokes take longer.
8. Clean brushes promptly. Rinse in odorless mineral spirits, then wash with soap and water. Liquin that dries in bristles is hard to remove.

How Much Liquin to Add

A frequent mistake is treating Liquin like a paint thinner and using it in large quantities. Strength of the film, gloss and drying time all change with the ratio.

These are working ranges, not strict rules. The common thread is that thin applications behave best. A thick stroke with lots of Liquin can skin on top and stay soft underneath.

Using Liquin for Glazing

Glazing is where Liquin earns much of its popularity. A transparent pigment mixed with a higher proportion of Liquin creates a clear, jewel-like layer that dries fast enough to stack glazes on consecutive days.

1. Make sure the underlayer is dry to the touch.
2. Choose a transparent pigment, such as a quinacridone, phthalo, alizarin-type red, transparent oxide or ultramarine.
3. Mix a small amount of paint with Liquin until it looks like tinted honey.
4. Apply thinly with a soft brush, then soften or wipe back with a lint-free cloth where you want less.
5. Allow at least a day before adding the next glaze.

Several thin glazes create more depth than one heavy one, and they dry more reliably.

Using Liquin for Underpainting and Layering

Because alkyd speeds drying, Liquin is useful in underpaintings that you want to paint over quickly. A thin, Liquin-modified underpainting can be dry by the next day, which lets you move into color without waiting a week.

The question is how that fits with the fat-over-lean principle: each layer should be at least as flexible as the one beneath and should not dry slower than it. Practical ways to stay safe:

• Use Liquin consistently through the painting, or use it in lower and middle layers and then switch to an oil-based medium for the final layers.
• Avoid a fast, Liquin-heavy top layer over slow, oil-rich layers. The top can crack if the layers beneath keep moving.
• Keep Liquin layers thin. Thick alkyd passages are where problems tend to appear.

Liquin With Thick Paint and Impasto

The original fluid version is not ideal for thick strokes; it will make paint looser and glossier. For textured passages, the stiffer impasto-type versions are designed to bulk up paint while still speeding drying. Even so, thick paint takes longer to dry through, so give impasto areas days rather than hours before painting over them.

Thinning Liquin With Solvent

Some painters thin Liquin with a little odorless mineral spirits to make a more fluid glazing or washing medium. A mix of roughly equal parts can give very thin, fast-drying veils for toning a canvas or laying in a transparent underpainting.

Keep two points in mind. First, adding solvent makes the mixture leaner, so it belongs in early layers rather than the final ones. Second, very dilute mixtures carry less binder, and over an absorbent ground they can dry patchy. If a thinned glaze looks dull and uneven once dry, add a touch more Liquin to the next mix and less solvent.

Liquin for Different Painting Approaches

Alla prima and plein air

For single-session work, a small amount of Liquin, around 5 to 10 percent, helps the painting become dry enough to transport within a day or two without making the paint tacky while you work. Larger amounts can start to drag on the brush late in a session, so stay modest.

Classical layered painting

Liquin fits well with the grisaille-then-glaze approach. A monochrome underpainting with a little Liquin can be dry overnight, and successive color glazes with more Liquin can be applied on consecutive days. The overall sequence stays consistent because the same medium runs through every layer.

Detailed and photorealistic work

The more fluid versions are popular with painters who rely on fine brushes. They help paint flow off the tip in long, unbroken lines and level brush marks in smooth areas such as skies and skin.

Textured and expressive work

For knife painting, the stiffer gel or impasto versions hold peaks while still speeding drying. The original fluid formula will soften peaks, so it is usually left out of heavily textured passages.

Drying Times to Expect

Drying depends on temperature, humidity, airflow, pigment and layer thickness. As a rough guide for thin to moderate applications:

• Tacky on the palette: about 30 to 60 minutes.
• Touch-dry on the painting: often within about 24 hours.
• Ready for another layer: usually the next day for thin layers.
• Thick passages: several days or more.

Some pigments dry slowly by nature, such as certain cadmiums and blacks bound in slower oils, and Liquin will speed them up but not to the same degree as fast-drying earths.

Varnishing a Painting Made With Liquin

Because the surface dries faster, it is tempting to varnish early. Remember that surface-dry is not the same as fully cured. Many painters still wait until thin paintings have cured for at least several weeks, and thick ones for months, before applying a final varnish. Follow the instructions on your chosen varnish, and test if you are unsure.

Common Mistakes With Liquin and How to Fix Them

Paint turns gummy on the palette

You mixed too much too early. Mix small batches as needed. Adding solvent to tacky Liquin paint produces a weak, stringy mix that does not brush well.

Shiny and dull patches across the painting

Liquin was used in some passages and not others. Use it consistently across a layer, or even out the sheen later with a final varnish.

Wrinkling or skin over soft paint

The layer was too thick or contained too much medium. Scrape off once firm, and repaint thinner.

Cracks in a top layer

A fast, rigid top layer may have gone over slow, oil-rich lower layers. In future, use Liquin lower down or consistently throughout.

Brushes ruined after one session

Liquin dried in the bristles. Clean brushes during breaks and immediately after painting.

Liquin vs Linseed Oil vs Solvent

Storing Liquin and Keeping It Usable

Because Liquin dries by oxidation, air is its enemy in storage as well as its friend on the canvas. A tube or bottle left loosely capped can develop a skin or thicken over time.

• Wipe the threads of the tube or bottle neck before capping, so dried medium does not glue the lid shut or stop it sealing.
• Squeeze air out of tubes by rolling from the bottom, which reduces the air that can thicken the contents.
• Store at room temperature, away from heaters and direct sun, which speed thickening.
• Discard medium that has turned stringy or rubbery. Thinning thickened Liquin with solvent does not restore its original behavior.

On the palette, a small scrap of plastic wrap pressed directly onto a pre-mixed pile of paint and Liquin can buy you a bit more working time during a break, though it will not keep it fresh overnight.

Safety Tips

• Ventilate the room; do not paint with Liquin in a closed space.
• Keep the tube or bottle capped.
• Avoid skin contact for long periods; gloves help.
• Lay medium-soaked rags flat to dry outdoors or keep them in a sealed metal container with water, since alkyd and oil-soaked rags can self-heat.
• Keep away from open flames.

FAQs

Can you mix Liquin with linseed oil?

Yes. Some painters add a little linseed or stand oil to Liquin to slow it slightly and add richness. Keep the combined medium modest in the paint, and use the oilier mix in later layers.

How long does Liquin take to dry?

Thin layers are often touch-dry within about a day. Thicker strokes can take several days. Full curing takes much longer, as with all oil paint.

Can you use Liquin with water-mixable oils?

Small amounts can work, but large amounts reduce the paint’s ability to mix with water. Water-mixable oil lines have their own mediums designed for compatibility.

Does Liquin yellow?

Alkyd mediums generally resist yellowing better than heavy additions of linseed oil, though any medium can change slightly over many years, especially in thick applications.

Can you use Liquin for the first layer of a painting?

Yes. Many painters use it in thin underpaintings because it speeds drying. Just make sure later layers are not leaner or faster-drying than the base.

Is Liquin toxic?

It contains a petroleum solvent, so vapors should not be inhaled in an unventilated space. Read the label’s safety information and work with good airflow.

Next Step

Once you know how much Liquin to add and where it belongs in the layer order, the version you use makes a real difference: fluid formulas suit detail and glazes, and stiffer ones suit texture. To compare current options and work out which suits your style, see our guide to choosing a Liquin medium for oils.