How to Use Pouring Medium with Acrylic Paint? | Smooth Pours Without Cracks

Pouring medium is mixed with acrylic paint to create fluid, pourable color that dries to a smooth, glossy finish without cracking.

The pouring technique turns acrylics into self-leveling rivers of color, and the medium is the ingredient that makes it work. Rather than thinning paint with water and risking a weak, brittle film, pouring medium preserves paint strength while delivering the thin, flowing consistency pours demand. Getting the ratio right and managing drying conditions separates a flawless pour from a cracked, crazed mess.

The Mixing Ratio: Start With 1:1 and Adjust

Adjust from there based on the paint’s thickness and desired consistency. Acrylic Ink and Heavy Body Acrylic each behave differently:

• Acrylic Ink — already thin, so it needs less medium to reach pouring consistency.
• Soft Body Acrylic — the standard starting point; the 1-tablespoon-to-1-cup ratio works well.
• Heavy Body Acrylic — thicker than Soft Body, so add more medium or, ideally, start with Soft Body for pours.

For custom colors, mix your color thoroughly before combining it with the medium to avoid streaks or unmixed pockets. Testing top-rated pouring mediums side by side makes differences in flow and finish easier to spot before you commit to a brand.

How Do I Prepare the Paint and the Pouring Surface?

Proper prep prevents most common pouring failures. Prepare the surface with gesso or primer as you would for any acrylic work, and set up away from dust, fans, and AC blowers.

Key setup steps:

1. Stir the medium and paint gently to avoid whipping in air and creating foam.
2. If bubbles form, let the mixture sit so they rise and burst on their own.
3. Pour the mixture slowly onto the surface, letting it pool and move naturally.
4. Use a funnel, squeeze bottle, pitcher, or jug to direct the flow with more control.

Liquitex recommends stretched canvas, board, paper, and glass for pouring. Whatever you choose, get it level before pouring. Uneven surfaces cause paint to pool in low spots and run thin elsewhere, creating thin areas that may tear as they dry.

What Not to Do: Common Pouring Mistakes

Three avoidable mistakes ruin more pours than anything else: adding water, pouring on a tilted surface, and pouring too thickly.

Do not add water to Liquitex Pouring Medium — official guidance is direct on this point. Water affects paint-film strength and leaves a fragile, brittle finish that cracks easily. The medium already contains everything needed to thin paint while preserving its integrity.

Pouring too thickly is the second trap. Anything thicker risks cracking as the paint cures.

Keep the wet surface protected while it dries. Golden recommends tenting — setting up a loose cover, like a cardboard box or plastic sheet, over the piece to keep dust, hair, and particles off the wet surface. Invisible dust becomes a permanent blemish once the paint dries.

How Long Does Pouring Medium Take to Dry?

Plan for at least 1 to 2 days of dry time, depending on paint thickness. Thicker pours — even within the 1/8-inch safety limit — need the full end of that range and sometimes longer, since the paint cures from the top down and trapped moisture needs time to escape.

Hold the piece level the entire time it dries. Moving or tilting a wet pour shifts the paint into waves and creates crazing, the network of fine cracks that appears when the surface dries at a different rate than the layers beneath it.

All Liquitex pouring mediums are intermixable with Liquitex colors and other Liquitex mediums and are permanent once dry. Liquitex’s pouring medium product page details the full range, including Gloss, Matte, and Iridescent versions, so you can match the finish to your piece.