Quick answer: Liquin is made of an alkyd resin (an oil-modified synthetic polyester) dissolved in a petroleum-based solvent similar to odorless mineral spirits, with additives that give it a gel-like, thixotropic body. The alkyd resin is what speeds drying and adds gloss and flow; the solvent thins it so it mixes into oil paint, then evaporates. In short, Liquin is an alkyd painting medium rather than an oil-and-turpentine mixture.
Winsor & Newton’s Liquin sits on the medium shelf of many oil painters, yet the label tells you very little about what is inside. People reach for it because it makes oil paint dry faster and flow more smoothly. Understanding what Liquin is made of explains why it behaves the way it does, how to use it safely, and where its limits are.
This guide breaks down the ingredients, compares the different Liquin formulas, and covers practical use in oil painting, including ratios, layering and safety. Where details are proprietary or debated, they are flagged as such. If you simply want to know which version to buy, our comparison of Liquin formulas for oil painting covers that in detail.
The Main Ingredients in Liquin
Winsor & Newton does not publish an exact recipe, but its product descriptions and safety data sheets point to three main components.
| Component | What it is | What it does in the medium |
|---|---|---|
| Alkyd resin | A synthetic polyester resin modified with vegetable oil fatty acids | Forms a tough film, speeds drying, adds gloss and transparency |
| Petroleum distillate solvent | A refined hydrocarbon solvent in the mineral spirits family | Keeps the resin fluid so it can be brushed and mixed; evaporates as the film forms |
| Rheology additives | Thickening or thixotropic agents (proprietary) | Give the gel-like body that thins when brushed and sets when left alone |
Manufacturers often include small amounts of drying agents in alkyd mediums to control curing. Whether and which driers are present in a specific Liquin formula is not fully disclosed, so check the current safety data sheet if this matters to you.
What exactly is an alkyd resin?
Alkyds are made by reacting a polyol (such as glycerol or pentaerythritol) with a dibasic acid (such as phthalic anhydride) and fatty acids from drying oils. The name comes from that chemistry: alcohol plus acid. The oil component means alkyds cure partly through oxidation, the same process that dries linseed oil. The polyester backbone means they set into a firm film much faster than oil alone.
That combination is why alkyds mix so readily with oil paint. They share the same drying mechanism, and the paint film ends up as a blend of oil and alkyd.
Why the solvent matters
Alkyd resin on its own is thick and sticky. Dissolving it in a mineral spirits-type solvent makes it workable. Once applied, the solvent evaporates, and the resin and oil in the paint begin to cure together. This is also why Liquin has a noticeable solvent smell and why ventilation is important.
How Liquin Differs From Traditional Oil Mediums
Before alkyds, oil painters made mediums from oils, resins and solvents: linseed or stand oil, damar or copal resin, and turpentine. Liquin replaces natural resin and much of the oil with a synthetic alkyd.
| Medium type | Typical makeup | Drying speed | Handling |
|---|---|---|---|
| Linseed oil | Pressed flax seed oil | Slow (days) | Increases gloss and flow, slows drying |
| Stand oil | Heat-thickened linseed oil | Slow | Smooth, enamel-like levelling |
| Traditional painting medium | Oil + natural resin + turpentine | Moderate | Variable; natural resins can yellow or become brittle |
| Liquin (alkyd) | Alkyd resin + petroleum solvent + additives | Fast (often touch dry in about a day in thin layers) | Smooth, slightly gelled, good for glazing and detail |
Alkyds are generally considered to resist yellowing better than heavy oil mediums, though behavior depends on thickness, pigments and conditions. Conservators continue to study the very long-term aging of modern alkyd paint films, so it is fair to describe them as well established but not as long-proven as traditional oil.
The Liquin Range: What Each Formula Is For
Several Liquin variations exist, each tuned for a different texture. The base chemistry is similar; the body and handling change.
| Formula | Consistency | Typical use |
|---|---|---|
| Liquin Original | Soft gel that turns fluid when mixed | General-purpose drying and flow; glazing |
| Liquin Fine Detail | More fluid | Fine lines, detail, smooth thin glazes |
| Liquin Light Gel | Light gel | Glazing with a bit more body, less brush drag |
| Liquin Impasto | Thick, buttery | Building texture and impasto while speeding drying |
| Liquin Oleopasto | Very thick, translucent | Heavy impasto and knife work |
Choosing between them depends on your style. Detail painters lean toward Fine Detail; glazers often prefer Original or Light Gel; textural painters reach for Impasto or Oleopasto. For a closer comparison of formulas and how they perform, our roundup of the best Liquin medium options covers each one in detail.
How to Use Liquin in Oil Painting
Knowing the ingredients helps you use Liquin well. Because it carries resin and solvent, a little goes a long way.
How to use Liquin Original
- Squeeze your oil colors onto the palette as usual.
- Place a small amount of Liquin nearby, about the size of a pea or coin.
- Mix a little into each color with a palette knife. Start with roughly one part Liquin to four or five parts paint.
- Increase the proportion for glazes, where you want thin, transparent, flowing color.
- Paint as normal. Expect the mix to begin tacking up within a few hours.
- Clean brushes promptly with odorless mineral spirits or a suitable brush cleaner before the medium sets.
Using a very high proportion of medium can make paint films weaker or overly glossy. Manufacturer guidance generally points to moderate use; stay within what the label suggests for your formula.
Liquin and fat over lean
Oil painting relies on the “fat over lean” principle: upper layers should be as flexible or more flexible than lower ones, which usually means more oil or medium as you move up. When adding Liquin, a simple approach is to use little or none in the underpainting, then keep the same or slightly increasing amounts in later layers. Avoid painting a lean, solvent-heavy layer over a layer rich in medium.
Glazing with Liquin
Liquin is popular for glazing because it makes transparent color flow evenly and dry quickly, so you can apply several glazes over a few days instead of weeks. Mix a transparent pigment with more Liquin than usual, brush a thin layer over a dry underlayer, and soften with a clean, dry brush if needed.
Drying Time: What to Expect
The alkyd resin is the reason Liquin speeds drying. Typical behavior, which varies with temperature, humidity, pigment and thickness:
- Thin layers: often touch dry within about 24 hours.
- Medium layers: may need a couple of days.
- Thick impasto with Liquin Impasto or Oleopasto: surface may set quickly but the inside cures more slowly.
“Touch dry” is not fully cured. Wait the usual period recommended for oil paintings, often six months or more depending on thickness, before applying a final picture varnish.
Safety and Handling
Because Liquin contains a petroleum solvent and a drying resin, treat it with the same care as any solvent-bearing medium.
- Ventilation: Work in a well-ventilated room and avoid breathing vapors for long periods.
- Skin contact: Use gloves or barrier cream if you are sensitive, and wash hands after painting.
- Flammability: Keep it away from open flames and heat sources.
- Rags: Rags soaked with oils and alkyd mediums can heat up as they cure and, in rare cases, ignite. Lay them flat to dry outdoors or store them in a sealed metal container with water before disposal.
- Disposal: Never pour Liquin or used solvent down the drain. Follow local hazardous waste guidelines.
- Read the label: The current safety data sheet lists the specific hazards and handling instructions.
Using Liquin for Different Painting Approaches
Alla prima (wet-into-wet)
If you finish paintings in one session, Liquin’s fast tack can work against you. The paint may start to drag after a couple of hours, making late blending harder. Use only a little, or skip it in areas you plan to blend at the end of the session.
Indirect, layered painting
This is where Liquin shines. A grisaille or monochrome underpainting can be dry enough to glaze over within a day or two, rather than waiting a week. Keep a consistent, modest amount of medium in each layer so flexibility stays even through the stack.
Detail and line work
The more fluid Fine Detail formula helps paint flow off a small round or liner brush for hair, rigging, grasses and lettering. A drop mixed into the color can make long, unbroken lines much easier.
Impasto and knife painting
Thick oil paint can take a very long time to dry. The impasto versions add body while speeding curing, so heavy textures set faster. Even so, thick passages cure from the outside in, so allow extra time before varnishing.
How to Store Liquin
- Close the cap tightly after each use; exposure to air starts the curing process.
- Wipe the bottle neck so dried medium does not glue the cap shut.
- Store at room temperature, away from direct sunlight and heat.
- If the medium thickens noticeably or forms skins inside the bottle, it is reaching the end of its usable life.
- Squeeze or pour small amounts onto the palette rather than dipping brushes into the bottle, which introduces pigment and speeds spoilage.
Common Mistakes With Liquin
- Using too much. Excess medium can create a glassy, weak film and wrinkling. Keep it modest.
- Leaving it on the palette overnight. It will skin over and become unusable. Mix only what you need.
- Using it as a final varnish. Liquin is a painting medium, not a removable picture varnish.
- Ignoring fat over lean. Inconsistent medium use between layers can lead to cracking.
- Letting brushes dry with it. Cured alkyd is hard to remove from bristles. Clean them promptly.
Why Liquin Feels Different on the Brush
Painters often describe Liquin as “silky.” That sensation comes from its thixotropic additives. At rest, the medium holds a soft gel shape, which is why it does not run off the palette. Under the pressure and movement of a brush, the gel structure breaks down and it flows freely. When you stop brushing, it begins to thicken again, helping glazes stay put instead of sagging or pooling at the bottom of a vertical canvas.
The alkyd resin also contributes. It wets pigment particles well and levels brush marks slightly, so thin color looks smoother and more even than paint thinned with solvent alone.
Alternatives If You Want to Avoid Solvents
Some painters prefer solvent-free studios. Options include:
- Linseed or walnut oil for flow, accepting slower drying
- Solvent-free alkyd gels offered by some brands, which speed drying without a petroleum solvent
- Fast-drying pigments such as earth colors in the underpainting
- Water-mixable oils with their own dedicated mediums
Each has trade-offs in drying time, gloss and handling, so test on a scrap panel before switching mid-painting.
FAQs
What is Liquin made of?
Liquin is made of an alkyd resin dissolved in a petroleum distillate solvent, with additives that give it a gel-like texture. The alkyd speeds drying and improves flow, while the solvent evaporates after application.
Is Liquin toxic?
Liquin contains a petroleum-based solvent, so it can irritate skin and lungs with prolonged exposure. Use it in a ventilated space, avoid ingestion and skin contact, and read the product’s safety data sheet.
How do you use Liquin in oil painting?
Mix a small amount into oil paint with a palette knife, starting at about one part Liquin to four or five parts paint. Use more for glazes and keep the proportion consistent or increasing in upper layers.
Does Liquin yellow over time?
Alkyd mediums are generally regarded as less prone to yellowing than heavy linseed oil mediums, though results depend on thickness, pigments and storage conditions.
Can you use Liquin with acrylic paint?
No. Liquin is designed for oil paints and alkyd paints. It will not mix properly with water-based acrylics.
How long does Liquin take to dry?
Thin layers mixed with Liquin are often touch dry in about a day. Thicker passages take longer, and full curing still follows normal oil painting timelines.
Final Thoughts
Liquin is an alkyd resin carried in a mineral spirits-type solvent, engineered to make oil paint dry faster and flow more easily. Knowing that helps you use it sparingly, ventilate your space, follow fat over lean and keep it off your final varnish layer.
If you are deciding which version suits your painting style, our guide to the top Liquin mediums for oil painters compares Original, Fine Detail, Impasto and other formulas side by side.
