CosClay Liquids

CosClay Liquids is the liquid version of the flexible polymer clay CosClay, available in three hardness variants to suit every technique and outcome. It cures in the oven just like solid clay, accepts pigmentation before curing, and can be used for mold casting, surface coating, detail layers, or as a painting medium. An essential tool for professional sculpture, special effects, and the production of flexible ornamental pieces.

Technical specifications

What it's used for

All three variants share the same core applications, differing only in the final result in terms of rigidity and translucency. They are ideal for work requiring precise detail combined with flexibility in the finished piece:

• Mold casting to create high-definition flexible ornamental pieces
• Coating of sculptural surfaces to unify textures or add colour layers
• Detail enhancement on pieces already sculpted in solid polymer clay (CosClay Sculpt)
• Painting medium mixed with pigments to apply translucent layers or skin tones
• Repairs and joins between polymer clay pieces before curing
• Special effects: skins, membranes, flexible organic textures
• Filling silicone molds to obtain soft, detailed replicas
• Making cosplay accessories and props that require deformation or movement

How to use it

1. Choose the right variant: FlexFlo for general use and standard casting, Stretch FX if you need maximum elasticity, Firm FX for pieces with greater structural rigidity.
2. Pigment if needed: add alcohol inks, mica powders or oil-based pigments directly to the bottle and mix well before use. The proportion depends on the desired colour intensity.
3. Apply or pour: for casting, pour into the mold (preferably silicone) and remove bubbles with a cocktail stick or by gently swirling. For surface finishes, apply with a brush, spatula or precision syringe.
4. Degas if needed: for work requiring maximum definition, you can use a vacuum chamber before curing to eliminate micro-bubbles.
5. Cure in the oven: follow the manufacturer's temperature and time instructions for polymer clay (typically between 110–130 °C depending on piece thickness). Do not exceed the recommended temperature.
6. Demold and finish: once cured and cool, remove the piece from the mold. It can be sanded, painted with acrylics or compatible finishes, or combined with other polymer clay pieces.

Tips and tricks

Mixing variants to adjust hardness

All three CosClay Liquids variants are compatible with each other. If you need an intermediate rigidity between FlexFlo and Firm FX, mix them directly in the bottle or in an auxiliary container before applying. Always test the mix on a small amount before working with the full batch, as the exact ratio depends on the visual and tactile result you are looking for.

Pigmentation: how much is enough

Pigments and mica powders disperse well in the liquid base, but in excess they can alter the curing or the final flexibility. As a starting point, add a small amount (a spatula tip per 10–15 ml of product) and gradually increase until you reach the desired tone. Alcohol inks are particularly effective for achieving saturated, translucent colours in Stretch FX. Avoid water-based pigments: they can interfere with curing and the homogeneity of the mix.

Compatibility with solid polymer clays

CosClay Liquids adheres perfectly to uncured pieces of CosClay Sculpt and to similar solid polymer clays such as Super Sculpey or Super Sculpey Firm. Apply a thin layer over the uncured piece, cure both materials together, and you will get a solid bond. For already-cured pieces, adhesion is lower and may require light sanding of the surface beforehand.

Frequently asked questions