Winsor & Newton Galeria Flow Improver Additive, 250 ml, Surface-Tension Reducer, Levels Flats, Give Smooth Texture, Removes Buggyness

By lowering the surface tension of the paint mixture, the additive encourages better flow and self-levelling. This reduces visible brush marks and produces a more uniform, flat finish across large areas.

Add a small amount to your paint or thinning medium. Start with roughly 1–2% by volume (about a drop or two per 10 ml) and mix thoroughly. For pours or inks, blend into the paint–water mixture to control flow, then test on scrap surfaces before applying to your artwork.

It’s formulated for water-based acrylics like Winsor & Newton Galeria and works with other water-based media (inks, gouache) to enhance flow. Avoid solvent-based paints unless the manufacturer specifies compatibility.

Use it to smooth out large flat areas, reduce brushmarks in gradients, enable controlled pours, and soften the texture of ink or fluid techniques to achieve even coverage.

Because a little goes a long way, begin with 1–2% by volume and adjust in small increments toward 5% if you need more pronounced levelling. Always test on a scrap surface first.

It’s suitable for many water-based systems, including other acrylic brands. Always test with your specific paints to verify compatibility and prevent color shifts or changes in viscosity.

Store tightly closed in a cool, dry place away from direct sunlight. Use in a well-ventilated area and wear protective gloves if you have sensitive skin. Avoid ingestion and contact with eyes; in case of contact, rinse with water and seek medical advice if needed.

Rinse tools with clean water after use. Do not dispose of large quantities down the drain. Seal the bottle when not in use and follow local regulations for disposal of chemical additives.

If you’re evaluating alternatives on Fepy, you can consider: 1) Liquitex Flow Aid 237 ml — https://fepy.com/product/liquitex-flow-aid-237ml 2) Winsor & Newton Galeria Flow Improver Additive 125 ml — https://fepy.com/product/winsor-newton-galeria-flow-improver-additive-125ml 3) Pebeo Flow Improver 100 ml — https://fepy.com/product/pebeo-flow-improver-100ml. These options let you compare performance, dosage, and price across brands.

Yes—start with a small dose, mix thoroughly, and test on a scrap surface before applying to your piece. Maintain a consistent thinning approach across the painting process, and avoid over-adding, which can over-thin the film.

For large areas and smooth gradients, use the additive to improve flow and leveling, which helps prevent uneven patches and brushlines. Combine with proper brush technique and even layering for best results.