GOLDEN Wetting Aid acrylic flow improver, 118 ml bottle — improves spread & even staining

GOLDEN Wetting Aid is a concentrated acrylic additive that lowers surface tension so highly diluted acrylics spread, penetrate, and stain absorbent surfaces more evenly.

If you work with acrylic colour washes, stains, or very fluid mixes on raw canvas, paper, or primed grounds, controlling how the water and pigment move is essential. This 4 fl. oz. bottle from GOLDEN is formulated specifically to improve wetting and staining when paints have been thinned heavily with water. It helps paint absorb into fibres rather than beaded droplets on the surface, giving you smoother, more consistent washes and better colour penetration without altering the paint’s colour strength.

How does this product change the behavior of diluted acrylics?

Wetting Aid lowers the surface tension of water-rich paint mixtures, which prevents beading and allows pigments to spread flat. Rather than sit on top of an absorbent surface, diluted paint moves into fibres for uniform staining and fewer uneven edges. It’s formulated to work with acrylic polymer emulsions so you retain acrylic binder properties while improving flow.

• Reduces surface tension for improved spread and contact with substrate
• Promotes even staining on canvas, paper, and raw supports
• Compatible with typical acrylic paints and mediums

When should I add Wetting Aid to my palette?

Use it when your paint has been strongly diluted with water and begins to bead instead of flowing. A few drops per mixture is usually enough; add incrementally until you see the desired wetting. It’s especially helpful for large colour washes, staining techniques, and when applying thinned paint to unprimed or highly absorbent surfaces.

• Add sparingly to avoid over-thinning—start small and test
• Ideal for colour washes, stains, and glazing where absorption is wanted
• Works well with airbrushing or spray applications if thinning is required

Will this affect drying time, sheen, or paint performance?

Wetting Aid is designed to improve wetting without significantly changing the binder’s fundamental properties. It is not a gloss or retardant medium, though using it with large amounts of water can make mixtures dry faster due to increased absorption into the support. For deliberate sheen or extended open time, pair it with the appropriate GOLDEN mediums.

• Does not act as a primary gloss or drying retardant
• May increase apparent drying on absorbent supports because of better penetration
• Can be combined with other GOLDEN additives for tailored finish and handling

How do I use it safely and get consistent results?

Always mix Wetting Aid into the paint/water blend gradually and test on a scrap surface. Keep containers tightly sealed and work in a well-ventilated area. For consistent outcomes, note the amount used per volume of paint so you can repeat successful mixes.

• Measure by drop or small volume; increase only as needed
• Test on a sample of the actual support before applying to a finished piece
• Store upright, capped, and away from extreme temperatures

Who is this for? GOLDEN Wetting Aid is aimed at painters, illustrators, and mixed-media artists who use thinned acrylic techniques—especially those working with raw or highly absorbent supports, large wash areas, or airbrush applications. It benefits professionals and studio hobbyists who want reliable, repeatable flow and staining behavior from their acrylic mixes without changing pigment characteristics. Made in the USA by an experienced, employee-owned company, this concentrated 4 fl. oz. bottle is a small but practical addition to any acrylic toolkit.