If you want smoother pours, easier blending, and more uniform coats with acrylics, a flow improver is essential. This guide highlights top picks that boost flow, reduce friction, and improve wetting without sacrificing color. The listed options fit a range of uses—from fine-detail airbrushing to broad canvas applications—so you can choose based on your technique and project type. The buyer-friendly table below summarizes five strong contenders.
| Product | Best For | Format | Notes |
|---|---|---|---|
| Liquitex Professional Effects Medium, Flow Aid | Staining, general acrylic painting on canvas | 118 ml | Binder-free with surfactants; great for staining on raw canvas |
| Mont Marte Premium Acrylic Flow Medium | Acrylic pours and thinning without color loss | 250 ml | Increases translucency slightly; enhances flow |
| Vallejo Airbrush Flow Improver for Acrylic Paints | Airbrushing and detailed work | 200 ml | Delays drying for smooth, uniform finishes |
| U.S. Art Supply Airbrush Flow Improver | Airbrushing with small tips and thicker paints | 8 oz | Reduces clogging; improves wetting and spray consistency |
| The Army Painter Airbrush Medium | Warpaint models and precise airbrush work | 100 ml | Thinner and flow improver in one bottle; easy to measure |
This article focuses on five practical options suitable for American readers seeking reliable acrylic flow improvers. Each product section describes who it’s best for, why it’s a strong pick, and a practical caveat to consider before purchase.
Liquitex Professional Flow Aid
Liquitex Flow Aid is a binder-free aqueous solution designed to aid flow and absorption during painting. It is especially useful when combined with any acrylic medium or color to reduce film tension and friction, enabling smoother application. Best for artists who want to extend open time and achieve even washes on raw or primed surfaces. A potential caveat is that, as a dedicated flow enhancer, it may not significantly alter color intensity on its own; use it in conjunction with your chosen medium.
Mont Marte Premium Acrylic Flow Medium
Mont Marte Flow Medium is designed to thin acrylic paints and mediums while diluting binders. It increases the translucency without dulling color intensity and enhances overall flow. This makes it a solid choice for acrylic pours and layered washes where you want smooth transitions. Limitations include a slight change in translucency that may influence final opacity on thick passages, so test on small areas first.
Winsor & Newton Professional Flow Improver
Winsor & Newton Flow Improver increases the flow of acrylic colors while maintaining color strength. It’s well-suited for hard-edge painting and flat color applications, helping achieve even areas without shifting hue. A potential limitation is that it may slightly slow drying time, so plan layers accordingly to prevent unintended smearing in fast-working sessions.
Vallejo Airbrush Flow Improver
Vallejo Flow Improver is formulated for airbrush applications, improving fluidity and delaying drying for a more uniform finish. It’s ideal for detailed work and fine lines where precision is critical. Use in recommended proportions to avoid over-thinning, which can reduce color coverage and vibrancy in thicker layers.
U.S. Art Supply Airbrush Flow Improver
This 8-ounce flow improver is designed to reduce clogging and improve wetting in airbrush work. It blends surfactants, solvents, and acrylic binders to enhance flow through small-nozzle systems. Best for artists using fine-detail airbrushing or those who need consistent spray at lower pressure. A caution is to follow the recommended ratio to avoid making the paint too thin, which could hinder coverage in broader passages.
The Army Painter Airbrush Medium
The Army Painter Airbrush Medium combines thinning properties with flow improvement for miniature painting. It supports even coats and maximum coverage when using Warpaints and other acrylics in airbrush workflows. Choose this if you want a single bottle that acts as both thinner and flow improver. The trade-off is a smaller bottle size, which may require more frequent refills for large projects.
Buying Guide: Key Considerations for Acrylic Flow Improvers
- Application method: Airbrush vs. brush painting can influence which product is most suitable. Airbrush-focused formulas generally optimize nozzle flow and drying time.
- Color impact: Some flow improvers slightly affect translucency or color strength. Test on a scrap area to see how it interacts with your paints.
- Thinning ratio: Follow manufacturer guidelines. Excessive thinning can weaken adhesion or reduce coverage in dense areas.
- Drying time: Some formulas slow drying. Plan layering and blending accordingly to avoid smearing.
- Packaging and usability: Bottle size, droppers, and pour spouts affect accuracy and convenience for your workflow.
FAQ
What is a flow improver used for in acrylic painting?
A flow improver lowers surface tension, increases wetting, and smooths the flow of paint across the surface, aiding even coverage and blending.
Can flow improvers affect color intensity?
Some formulas can alter translucency or drying time slightly. It’s best to test with your paints to see the impact on color.
Should I mix flow improvers with all acrylic paints?
It depends on the technique. For airbrushing or detailed work, a flow improver is often beneficial; for thick impasto styles, use sparingly or not at all.
Is a combined thinner and flow improver better than separate products?
Combination products offer convenience and consistent results, but performance varies by brand. Choose based on your workflow and preferred control.
How should I store flow improvers?
Store in a cool, dry place away from direct sunlight. Tighten caps to prevent evaporation and maintain consistency.