Acrylic water is a fake water effect used in dioramas, model railroads, terrariums, and craft projects to simulate realistic lakes, rivers, and oceans. You can make it using one of three main materials: two-part epoxy resin, acrylic gloss gel medium, or meltable plastic pellets. Each has different strengths depending on the depth of water you need, your budget, and how much time you want to spend.
Choosing Your Material
The right material depends mostly on how deep your water needs to be and how much detail you want in the surface texture.
Two-part epoxy resin produces the clearest, most glass-like finish and works best for deep water effects like lakes, ponds, and rivers. It cures hard and crystal clear, making it the gold standard for realistic water. The tradeoff is cost, curing time (24 to 96 hours depending on depth), and the need for proper ventilation.
Acrylic gloss gel medium is cheaper, safer, and cleans up with water. It works well for shallow water effects and surface textures like ripples and waves. It dries tough, durable, and scratch resistant. For beginners or anyone working on a model railroad or small diorama, this is the easiest starting point.
Meltable plastic pellets (sometimes sold as “solid water” or moldable plastic) offer a quick-set option. You heat water above 150°F, drop in the pellets, and they turn completely clear and stick together after a few minutes. Once cool, they harden into a permanent shape. The downside: they can soften again in high heat, so avoid placing finished pieces in direct sunlight or hot cars.
How to Use Two-Part Epoxy Resin
Epoxy resin comes in two bottles: resin and hardener. You combine them at a specific ratio that varies by brand, so always check your product’s instructions. One critical detail: the mixing ratio by weight and by volume are often different for the same product. If your kit says “1:1 by volume,” don’t assume it’s also 1:1 by weight. Use the measuring method your product specifies.
Stir the two parts together for at least two minutes, scraping the sides and bottom of your mixing cup. Incomplete mixing is the most common cause of sticky, uncured spots in the finished piece. Stir slowly and deliberately rather than whipping the mixture, which introduces air bubbles.
Pour Depth Matters
Epoxy cures through a chemical reaction that generates heat. Pouring too thick a layer causes excessive heat buildup, which can crack the resin or create a boiling effect that ruins the finish. Standard arts and crafts resin should be poured no deeper than about 1/8 inch per layer. Deep pour resin formulas are designed for thicker applications of 2 to 4 inches per layer, but they take longer to cure: roughly 24 to 36 hours to become tack-free and 72 to 96 hours to fully harden.
If your project needs more depth than a single pour allows, pour in layers. Let each layer cure completely before adding the next. This approach also lets you add color variation between layers to simulate depth, which looks far more realistic than a single uniform pour.
Removing Air Bubbles
Bubbles are the enemy of clear acrylic water. After pouring, pass a heat gun (not a blow dryer) slowly over the surface. Keep the heat gun at a good distance from the resin and don’t linger on any one spot, which can scorch or warp the surface. The heat thins the resin’s surface tension just enough for trapped air to escape. A single slow pass within 10 to 15 minutes of pouring catches most bubbles before the resin begins to set.
Sealing Your Base Before Pouring
Porous materials like wood, foam, plaster, and painted surfaces will leak resin and release tiny air bubbles as the pour cures. You need to seal the base first. The most reliable method is to brush on a very thin layer of the same epoxy resin you plan to pour, let it cure completely, and then do your full pour on top. The initial coat soaks into the porous material and creates a watertight barrier.
An alternative for lighter-duty projects is to soak the base with a white glue and water mixture or a craft sealer like Mod Podge before the resin pour. This works for small, shallow water areas but may not hold up for deep pours where the resin’s weight creates more pressure on the seal. For anything deeper than a thin puddle, the resin-on-resin sealing method is more dependable.
How to Use Acrylic Gloss Gel Medium
Acrylic gloss gel medium is the low-commitment option. Squeeze it directly onto your diorama surface, spread it with a palette knife or old brush, and let it dry. It goes on white or milky and dries clear. Thin layers dry faster and clearer than thick ones, so build up depth gradually if needed.
The real advantage of gloss gel is surface texture. While it’s still wet, you can drag a toothpick, brush, or sculpting tool through it to create ripples, waves, and current lines. Work quickly, because the gel begins to skin over within minutes. For standing water like a calm pond, smooth the surface with a wet palette knife and leave it alone. For a rushing stream, use short choppy strokes. Once dry, the texture is permanent and scratch resistant.
You can layer gloss gel the same way you layer resin. Let each coat dry fully before adding the next. This builds depth without the risk of cracking, and each layer dries in a fraction of the time resin takes to cure.
Adding Color for Realistic Depth
Pure clear water looks unrealistic in most diorama settings. Real water picks up color from its surroundings: greens and browns in a forest pond, deep blues in open ocean, murky tans in a swamp.
For epoxy resin, use colorants specifically designed for resin. The three main types are alcohol inks, resin dyes, and pigment pastes. Start with an extremely small amount. A single drop of dye in a full mixing cup can be enough. You can always add more color, but you can’t take it away. Translucent dyes work best for water effects because they let light pass through the way real water does. Opaque pigments create a muddy, solid look that works for swamp water or polluted streams but not for clear lakes.
For acrylic gloss gel, mix in a tiny amount of acrylic paint before applying. The same rule applies: less is more. A touch of blue-green or olive makes a big difference. You can also paint the base surface underneath the gel before applying it. Dark greens and browns on the bottom of a “lake” create the illusion of depth even with a thin layer of clear gel on top.
Using Meltable Plastic Pellets
Heat water to above 150°F using a microwave or stovetop. Drop in the pellets and wait a few minutes until they turn completely clear and begin sticking together. Fish out the softened plastic and press it into your diorama basin. You have a few minutes of working time before it cools and stiffens. If it hardens before you’re done shaping, just reheat it in hot water and try again.
This method works best for small, shallow water features where you need a quick result. The plastic cools to a strong, permanent shape, and you can texture the surface while it’s still warm. Cover the finished piece with cold water or place it in the freezer to speed up the hardening process. The finish won’t be as glass-clear as cured epoxy, but for tabletop gaming terrain or quick craft projects, it gets the job done in minutes instead of days.
Safety When Working With Resin
Acrylic gloss gel and meltable pellets are low-risk materials that need only basic precautions. Epoxy resin requires more care. Wear nitrile gloves to protect your skin from both the resin and hardener, which can cause contact irritation or sensitization over time. Use a respirator with an organic vapor cartridge, not a basic dust mask, which won’t filter the volatile compounds resin releases during mixing and curing. Work in a well-ventilated space, ideally with a window open and a fan drawing air away from your face.