EVA AIR Black- Foam Clay Professional -

EVA AIR is an ultra-lightweight, mouldable EVA foam clay formulated specifically for cosplayers and professional makers who need to finish armatures, props and accessories with precise detail and minimal weight. It is worked by hand without special tools, air-dries in 24-48 hours and retains slight flexibility once cured, making it ideal for parts that must withstand movement or impact. Available in black, grey and white in 300 g containers.

Technical specifications

What it is used for

EVA AIR is designed for prop building and cosplay work where detail and low weight are the priority. Thanks to its direct adhesion to EVA foam sheets and its ability to be machined once dry, it integrates seamlessly into professional workshop workflows.

• Sculpting filigree, engravings and relief details on EVA armatures
• Building horns, gems, crests and decorative elements for props
• Sealing and filling joins between EVA sheets without adding weight
• Making grips, guards and detail elements for cosplay weapons
• Casting in silicone moulds for repetitive production of small parts
• Repairing and restoring damaged or deformed props
• Adding volume over thermoplastic bases without risk of heat deformation

How to use it

1. Knead the material for 1-2 minutes until you obtain a homogeneous, lump-free texture. The heat from your hands softens the material and improves workability.
2. Sculpt directly by hand or with silicone spatulas to achieve fine detail. If you are casting in a mould, press the material in firmly to avoid air pockets.
3. To bond it to a high-density EVA foam sheet, lightly scuff the EVA surface with 80-grit sandpaper before applying the material.
4. Apply uniform pressure to ensure full contact with the substrate.
5. Allow to dry at room temperature for 24-48 hours. For pieces thicker than 1 cm, rotate the piece every 12 hours to ensure even drying on all sides.
6. Once dry, sand with fine-grit sandpaper (180-320) to remove imperfections and achieve the desired texture.
7. Apply a flexible primer before painting with flexible acrylics to prevent cracking in flex zones.

Usage tips

Thickness control for even drying

EVA AIR dries from the outside in. Layers thicker than 8-10 mm may have a dry surface while the core is still soft. If you need volume, work in 5-8 mm layers and allow each one to dry before adding the next. This method also reduces the risk of surface cracks caused by shrinkage.

Finishing and machining

Once fully dry, the material accepts orbital sanding, rotary tool milling and cutting with a craft knife. Always wear a particle mask when using rotary tools, as the fine dust generated can irritate the respiratory tract. For seamless transitions between the foam clay and the EVA sheet, sand in circular motions starting with 120 grit and finishing with 320.

Painting and final finish

The porous surface of EVA AIR absorbs primer well, but it is advisable to apply two thin coats rather than one thick coat to avoid filling in the sculpted detail. Flexible acrylics and water-based paints adhere correctly. If you are going for a metallic or very smooth effect, apply a coat of flexible sealer between the primer and the topcoat to reduce absorption and make blending easier.

Frequently asked questions