Floating is the decorative painter’s way of shading: a soft band of color that fades from full strength to nothing across a single brushstroke. Floating medium makes that fade easier to achieve with fast-drying acrylics. This guide shows exactly how to use floating medium with acrylic paint, including brush loading, blending on the palette, stroke technique and fixes for hard edges and streaks.
Quick answer: Dampen a flat or angle brush with water and blot it, dip it into floating medium and blot again so the bristles are moist but not dripping, then dip just one corner into acrylic paint. Stroke the brush back and forth on the palette until the color fades smoothly across the bristles, then paint with the loaded corner along the edge you want shaded. The medium keeps paint flowing and blending into a soft gradient.
What Floating Medium Does
A floated stroke works because the brush carries pure paint on one corner and only clear liquid on the other. Water alone can do this, but it evaporates fast, beads up on slick basecoats and leaves watery blotches. Floating medium is a slightly thickened, slow-drying liquid that holds that gradient inside the bristles, glides over painted surfaces and dries clear.
In short, it gives you more control and more time. Floating medium is especially helpful on smooth basecoats such as craft wood pieces, ornaments and decorative panels, as well as in fine art for soft shadows on flowers, fabric folds and rounded forms.
It belongs to a broader family of acrylic additives. For a wider look at products that slow drying and smooth transitions, see our guide to the best acrylic paint mediums for blending.
Floating Medium vs Water, Retarder and Glazing Medium
| Liquid | Main job | Effect on floats |
|---|---|---|
| Water | Thins paint | Works but dries fast and can bead or bloom |
| Floating medium | Helps paint glide and fade within a side-loaded brush | Smooth, controlled gradient with soft edge |
| Retarder | Slows drying | More blending time; too much can stay tacky |
| Glazing medium | Builds transparent layers | Useful for glazes, less slippery for side loading |
What You Need
- Floating medium (sold by several craft and art paint brands)
- Acrylic paint; craft acrylics and soft body artist acrylics both suit floating
- A flat shader or angle shader brush, synthetic, with a sharp chisel edge, in sizes around 1/4 inch to 3/4 inch
- A water basin and paper towel
- A palette surface: a wax-paper palette or glass works well because the brush slides easily
- A dry, basecoated surface to paint on
Brush size matters more than people expect. Choose a brush whose width roughly matches the width of the shadow band you want. A 1/2-inch brush gives a float about 1/2 inch wide.
How to Use Floating Medium With Acrylic Paint: Step by Step
- Prepare the basecoat. Make sure the area is completely dry. Floating over damp paint lifts it. Two thin basecoats give a smooth surface that shows floats cleanly.
- Dampen the brush. Dip it in water, then blot both sides on a paper towel. The bristles should look moist with no shine of standing water.
- Load floating medium. Dip the brush into the floating medium and blot lightly again. Excess medium makes the paint spread too far and creates a halo.
- Side-load the paint. Touch only one corner of the brush into the edge of a paint puddle. About one-third of the brush width should pick up color.
- Blend on the palette. Stroke the brush back and forth in one short track on the palette, keeping the paint corner on the same side. Flip and repeat on the other face of the brush. Continue until the color fades evenly from the loaded corner to clear on the opposite corner, with no visible line.
- Paint the float. Place the loaded corner against the edge you want darker, such as the base of a petal or the inside of a fold, and pull a smooth stroke with steady pressure. Keep the clear side facing the open area.
- Let it dry, then repeat. For deeper shading, add a second float after the first dries, slightly narrower than the first. Building layers gives richer depth than loading a lot of paint at once.
- Clean the brush often. Rinse and reload every few strokes so old paint does not creep across the bristles and kill the gradient.
Floating Variations
Back-to-back float
Float one edge, flip the brush and float back alongside it so the color sits in the middle with soft edges on both sides. Useful for creases, veins and center shading.
Walk-out float
Start a float, then move the brush outward slightly with each stroke to widen the shaded band. This creates broad, soft shadows without using a larger brush.
Highlight float
Load the corner with a lighter tint instead of a shadow color and float along edges facing the light source. Combining shadow and highlight floats gives strong three-dimensional form.
Tint float
Use a very transparent color to add a subtle blush, for example a soft rose float on cheeks or fruit, without obvious shading.
Floating vs Side Loading vs Double Loading
These terms overlap, which confuses many beginners. Side loading describes how the brush is loaded: paint on one corner, clear medium or water across the rest. Floating describes the resulting stroke, a gradient that fades into the surface. In practice, painters use both words for the same action.
Double loading is different. You load two colors, one on each corner of a flat brush, and blend them on the palette so the stroke shows both colors merging in the middle. It is used for one-stroke leaves, petals and ribbons. Floating medium helps here too, because it keeps both colors moist enough to blend in the bristles rather than drying into a stripe.
A good learning order is side loading first, then floats, then double loading. Each skill builds on the control you gain from the previous one, and floating medium makes all three easier on fast-drying acrylics.
Choosing Shading Colors for Floats
A float is only as good as the color you load into it. The most natural shadows usually come from a darker, slightly cooler or more neutral version of the basecoat, not from black.
| Basecoat | Shadow float idea | Highlight float idea |
|---|---|---|
| Warm red | Red mixed with a touch of burnt umber or deep violet | Red with a little warm white or yellow |
| Sky blue | Ultramarine with a hint of burnt sienna | Blue lightened with white |
| Leaf green | Green deepened with a dark blue or umber | Green with a little lemon yellow |
| Skin tone | Burnt sienna or a soft red-brown | Warm white with a hint of the base |
| White fabric | Pale grey-blue or warm grey | Pure white on the brightest edge |
Test the float color on a scrap of the same basecoat. A color that looks right on the palette can look too heavy once it spreads into a thin gradient, and transparent mixtures usually float better than opaque ones.
Floating on Different Surfaces
Wood and MDF craft pieces
Sand lightly, seal and basecoat twice. A smooth, sealed surface lets the brush glide and keeps the gradient even. Raw wood soaks up the medium and leaves patchy edges.
Canvas
Canvas weave breaks up a float slightly. That can look pleasant on loose work, but for crisp decorative shading, fill the weave with an extra layer of gesso and sand it smooth before basecoating.
Paper and illustration board
Heavy paper works if basecoated, but floats on bare paper sink in fast. Use a little extra medium and work quickly.
Glass, ceramic and metal
Slick surfaces make paint bead up. Use a surface-specific primer or acrylic enamel base first, then float on top. Floating medium helps paint stay put on these smooth grounds.
How Many Floats Do You Need?
Depth comes from layering, not loading. A soft shadow on a leaf might need just one or two floats. A deep fold in drapery could take four or five, each slightly narrower than the last, so the darkest value sits tight against the edge.
Let each layer dry before adding the next, usually only a few minutes for thin acrylic floats. A hair dryer on low can speed this up. Building in stages also lets you stop at the moment the form looks right, which is far easier than trying to remove paint after overdoing a single heavy stroke.
Common Problems and How to Fix Them
Hard line on the clear side
The brush was not blended enough on the palette, or it carried too much paint. Blend longer, use less paint, or reload with medium.
Paint spreads into a blotchy halo
Too much floating medium or water. Blot more thoroughly before side loading.
Streaks inside the float
The brush is worn, or the bristles are splayed. A sharp chisel edge is essential. Streaks also appear when pressure changes mid-stroke.
Float lifts the basecoat
The basecoat was not dry, or you scrubbed back and forth. Let basecoats cure and use single, confident strokes.
Color too weak
Build it up with additional floats rather than loading more paint. Several soft layers look smoother than one heavy one.
Acrylic Painting Tips and Techniques That Improve Floats
- Practice on black paper or a basecoated card. Paint rows of floats until the gradient looks consistent. This builds muscle memory quickly.
- Use transparent colors for shading. Transparent paints blend into the clear side more gracefully than opaque ones.
- Mix shading colors from the basecoat. A shadow made by darkening the basecoat hue usually looks more natural than black or grey.
- Keep the palette moist. A damp palette paper or a misting spray prevents the paint puddle from skinning over.
- Rotate the work, not your wrist. Turn the piece so you can pull strokes comfortably in your natural direction.
Painting Tips for Acrylic Shading by Skill Level
| Level | Focus | Practice drill |
|---|---|---|
| Beginner | Clean side loading and blending | Ten straight floats on a card, checking for a smooth fade |
| Intermediate | Curved floats and walk-outs | Shade a set of circles to look like spheres |
| Advanced | Layered shadows and highlights together | Paint a rose or drapery using only floats for form |
Related Medium Questions
How to use crackle medium for acrylic paint
Crackle medium is applied between a base coat and a top coat so the top layer splits as it dries. It is a textural effect, the opposite of the smooth gradient a float creates.
How to use glazing medium with acrylic paint
Mix a small amount of paint into glazing medium and brush thin, transparent layers over dry paint. Glazing deepens color across a whole area, while floating shades a specific edge.
Acrylic paint vs regular paint for floating
Craft and artist acrylics are designed for this kind of work. Household wall paints are too thick and opaque to float cleanly.
FAQs
Can I use water instead of floating medium?
Yes, many painters float with water. Floating medium simply makes the paint glide farther and stay workable longer, which helps on slick surfaces and in dry climates.
What brush is best for floating?
A synthetic flat or angle shader with a sharp chisel edge. Pick a size that matches the width of the shading you want.
How much floating medium should I use?
Just enough to moisten the bristles. Dip, then blot on a paper towel until the brush no longer looks shiny.
Does floating medium change the color of paint?
It dries clear, so color stays true. It does make paint more transparent as it spreads toward the clear side of the brush.
Can floating medium be used with heavy body acrylic?
Yes, but thin heavy body paint slightly with water first so it side-loads evenly.
Why does my float look streaky?
Usually a worn brush, uneven pressure or not enough blending on the palette before painting.
Next Step
Practice side loading on scrap until the gradient looks seamless, then start using floats for shadows and highlights on real projects. If you want more control over blending in general, explore our comparison of the acrylic blending mediums that give the smoothest transitions, including retarders and slow-dry gels that pair well with floating.
