Quick answer: To use the Army Painter wet palette, soak the foam sponge in water until saturated, press it into the tray, pour off any standing water so the foam is wet but not swimming, lay one sheet of the hydration paper on top, smooth it flat, and wait a minute for it to turn translucent. Put small dabs of acrylic paint on the paper, mix on the paper, and the water wicking up from below keeps the paint workable for hours. Snap the lid on between sessions and the paint stays usable for days. Change the paper when it gets crowded and rinse the sponge every few days to prevent mold.
A wet palette is the single accessory that changes miniature and acrylic painting the most for the least money, and the Army Painter version is one of the most common first purchases because it ships ready to go. But the box does not explain why the paper goes translucent, how wet is too wet, or what to do when the paint looks fine on the palette and dries weirdly on the model. This guide on how to use army painter wet palette kits answers those from first setup through daily use, maintenance, and troubleshooting.
Everything here applies to both the standard Army Painter Wet Palette and the larger Hydro Pack-compatible versions; the principles also apply to any sponge-and-paper wet palette. For how the Army Painter compares with other brands and homemade versions, the wet palette buying guide covers the field.
What Is in the Box
- The tray and lid. A shallow plastic base with a snap-on lid. Many versions include a silicone or rubber seal in the lid for airtightness, and a top surface with a wavy brush rest or slots.
- The foam sponge. A dense, flat foam insert cut to the tray size. Its job is to hold water and release it slowly upward.
- Hydration papers. A stack of thin, semi-permeable sheets, sometimes called palette paper or membrane. They sit on the sponge and allow water vapor and a small amount of liquid to pass through to the paint without the paint running.
- Optional extras depending on the kit: a wavy mixing insert, extra sponges, a brush holder, or a “Hydro Pack” of replacement foam and papers.
How a Wet Palette Works
Acrylic paint dries when water evaporates from it. On a dry plastic palette, a pea-sized dab is unworkable in five to fifteen minutes and skinned over in twenty. A wet palette replaces the water as fast as it leaves. The sponge is a reservoir; the paper is a barrier that lets water through slowly by osmosis and capillary action while keeping the paint on top. The result is paint that stays at a constant, workable consistency for hours, and under a closed lid, for days.
The paper is the critical part. Too thick or non-porous and no water reaches the paint; too thin or torn and water floods up and dilutes everything. The supplied hydration papers are chosen for the right permeability, which is why substitutes like regular parchment or baking paper give mixed results.
First Setup, Step by Step
- Wash the tray. Rinse with warm water to remove any manufacturing residue and dry it.
- Soak the sponge. Hold it under a running tap or submerge it in a bowl until it is fully saturated and heavy. Squeeze it a few times under water to drive out trapped air; a sponge with dry pockets will create dry spots on the paper later.
- Place it in the tray. Lay the wet sponge flat and press it gently into the corners so it sits level.
- Pour off standing water. Tilt the tray over the sink. You want the sponge saturated with no puddle around it. If you can press the sponge and water pools on top, pour off more. This step controls how wet the paint will be; most first-time problems come from skipping it.
- Lay the hydration paper. Take one sheet and place it on the sponge. Some painters briefly dip the paper in water first; others lay it dry and let it wick. Either works. Smooth it from the center outward with a finger to remove air bubbles and wrinkles. Bubbles create dry spots where paint will skin.
- Wait for translucency. After thirty seconds to two minutes the paper changes from opaque white to slightly translucent gray as water wicks through. That is the sign it is ready. If parts stay white, the sponge is dry there or there is an air bubble beneath; press and smooth.
- Test with a dab. Place a small amount of paint on the paper and watch it for a minute. It should stay glossy and hold its shape. If it spreads outward with a watery halo, the palette is too wet; lift the paper, pour off more water, and replace. If it dulls and starts to skin, the palette is too dry; add a tablespoon of water to the sponge at one edge.
Using It During a Painting Session
Loading paint
Squeeze or drop paint in dabs about the size of a lentil to a pea along one edge or in a row near the top. Leave the rest of the paper open for mixing. Small dabs are better than large ones; you can always add more, and a big blob takes on water unevenly and goes thin at its edges.
Dropper-bottle paints (the kind most miniature ranges use) can be placed directly. Thick tube acrylics should be laid down in slightly larger dabs because they take longer to reach working consistency.
Mixing
Pull a little from each dab into an open area with the brush and mix there. The paper is slick, so mixing is easy. Because the mix also sits on the hydrated surface, it stays workable just like the pure colors, which means you can mix a skin tone or a highlight series and keep it available for the whole session.
Thinning
You will need less water than on a dry palette because the paint is already hydrated from below. Touch the brush to the water pot, blot it on a paper towel, and then mix; add water in tiny increments. If paint on the palette is already thinner than you want, move it to a drier area of the paper (near an edge that has had less time to wick) or add fresh paint to the mix.
Between brush loads
The brush rest on the lid or tray edge keeps brushes off the paper. Do not leave a wet brush lying on the hydration paper; it adds water locally and can tear the sheet.
Long sessions
Over three or four hours, the sponge loses water to the room, especially in dry climates or under a hot lamp. Signs the palette is drying out: paint edges begin to look matte, the paper goes whiter at the corners, mixes thicken. Lift one corner of the paper and add a few tablespoons of water to the sponge, or spritz the sponge edge with a spray bottle. Do not pour water directly onto the paper.
Storing Paint Between Sessions
- Check the sponge is still well saturated. Add water if the edges look pale.
- Snap the lid on fully. Confirm the seal is seated all the way around.
- Keep it level and cool. A tilted palette lets water pool at one end and flood that side of the paper. Avoid direct sun and heat, which drive evaporation and encourage mold.
- Expect two to five days of usable paint, depending on humidity and how airtight the lid is. Metallics and some inks separate faster and may need a quick stir. Paint that has been sitting several days may be slightly more diluted than fresh; mix in a little new paint if needed.
- Peek daily if storing longer than a few days. A pink or black speck on the paper or a sour smell means mold or bacteria. Discard that paper, rinse the sponge thoroughly, and start fresh.
Maintenance
Changing the paper
Replace the hydration paper when it is crowded with old mixes, when it tears, or when colors start contaminating each other. For heavy users that is every session or two; for occasional painters, every few sessions. Lift it from one corner and peel slowly. A fresh sheet goes on the same sponge immediately.
Cleaning the sponge
Every few days of continuous use, or whenever you change paper, rinse the sponge under running water, squeeze it out several times, and resoak. Once a week or two, or at any sign of mold, give it a more thorough wash: a few drops of dish soap worked through, rinsed completely, then a soak in water with a small splash of white vinegar or a few drops of a household disinfectant, followed by another full rinse. Residual soap or disinfectant that reaches the paint can affect how acrylic flows, so rinse until no bubbles remain.
Preventing mold
- Use clean tap or distilled water. Distilled reduces mineral deposits and slows microbial growth.
- Add a few drops of a dedicated palette wetting agent, a splash of vinegar, or a very small amount of a copper-based additive if mold is persistent. Some painters add a drop of flow improver, which also helps paint behave.
- Let the sponge dry fully once a week if you can afford to restart; a dry sponge cannot grow mold.
- Replace the sponge when it stays discolored after washing or starts to smell even when clean.
Cleaning the tray
Wipe out any water at the bottom and any paint that has crept under the paper edges. Dried acrylic in the corners peels off; a soft brush with warm water removes the rest.
Getting the Water Level Right
| Symptom | Diagnosis | Fix |
|---|---|---|
| Paint spreads with a watery halo; mixes go thin on their own | Too wet | Lift paper, tilt tray to pour off water, press sponge lightly with a paper towel, replace paper |
| Paint dulls and skins within 20 minutes | Too dry, or paper not seated | Add water to sponge edge; smooth out air bubbles under paper |
| Paper stays white in patches | Dry pockets in sponge or trapped air | Press the patch; if it stays white, re-soak the sponge and squeeze under water |
| Paint runs to one side of the palette | Tray not level | Level the surface; pour off pooled water |
| Paper tears when peeling | Too dry when removed, or old | Dampen the edge first; replace paper more often |
| Thick paints never reach working consistency | Normal with heavy-body tubes | Lay larger dabs, wait 5 to 10 minutes, or pre-thin slightly |
| Metallics separate or go gritty | Metallic flakes settle; extended hydration | Load metallics fresh each session; stir before use |
| Paint dries fine on palette, dries patchy or glossy on model | Over-thinned by palette plus brush water | Blot brush before mixing; use less added water |
Paints That Work Well and Paints That Do Not
The wet palette is designed for acrylics: miniature ranges, artist acrylics, fluid acrylics, acrylic inks (which thin quickly and should be used soon after loading), and acrylic gouache. Contrast or speed-paint style formulas work but spread readily; keep them in small dabs near a drier edge.
Do not use oils, enamels, or solvent-based paints; they do not need hydration and will contaminate the sponge. Watercolor and gouache rewet by design and will simply dissolve into the paper. Very glossy mediums and varnishes can be mixed briefly on the palette but should not be stored on it.
Painters who also work in other formats sometimes keep a dry palette alongside for washes and glazes where a wet palette’s hydration is unhelpful; palette choices for very different disciplines are covered in guides such as the one on a palette for spray painting work, where a wet palette has no role at all.
Tips From the Setup That Matter Most
- Pour off the standing water. Nine out of ten “my paint is too thin” complaints trace back to a swimming sponge.
- Smooth the paper every time. A single air bubble becomes a dry island.
- Small dabs, many of them. Easier to manage than a few large blobs.
- Blot the brush before mixing. The palette already supplies water.
- Change paper before it looks disgusting. Cross-contaminated colors are the main reason mixes come out dull.
- Rinse the sponge on a schedule, not when it smells.
- Keep spare papers. Running out mid-project is the most common reason people try unsuitable substitutes.
FAQs
How much water should be in an Army Painter wet palette?
Enough to fully saturate the sponge with no standing water around it. After soaking, tilt the tray and pour off the excess until pressing the sponge does not raise a puddle. Add a tablespoon or two during long sessions as it dries.
Why does the hydration paper need to go translucent?
Translucency shows that water has wicked through the paper from the sponge and the surface is ready to keep paint hydrated. White patches mean dry spots where paint will skin.
How long does paint last on a wet palette?
Hours while open and typically two to five days with the lid sealed, depending on humidity and the seal. Metallics and inks separate sooner. Check daily for mold if storing longer.
Can you use parchment paper in an Army Painter wet palette?
Some painters do, with mixed results: baking parchment is less permeable than the supplied hydration paper and may keep paint drier, and some brands are coated and pass no water at all. The supplied papers or dedicated replacements are more predictable.
How do you stop mold in a wet palette?
Rinse the sponge every few days, use clean or distilled water, add a few drops of vinegar or a palette wetting agent to the water, let the sponge dry fully once in a while, and replace papers regularly. Discard any paper showing colored specks.
Can you use a wet palette for regular acrylic painting, not just miniatures?
Yes. Any acrylic benefits. Heavy-body tube paints take a few minutes to hydrate and should be laid in slightly larger dabs; fluid acrylics and inks hydrate almost immediately.
Next Step
Set the palette up once with the pour-off and smoothing steps done properly and most of the frustrations people report never appear. From there it is a matter of small dabs, a blotted brush, and a rinse schedule for the sponge. If you find yourself wanting more mixing area, a deeper water reservoir, or a tighter seal than the Army Painter provides, the roundup of wet palettes for acrylic painters compares the alternatives on exactly those points.
