Shopping Cart
Super Sculpey Flex Firm 454g
204302400
€20.00
24,20 € Tax incl.
24,20 € Tax incl.
Extra-firm polymer clay that stays flexible after baking, stone-grey, 454g (1lb). Cures at 130°C — perfect for precision sculpting.
The Super Sculpey Flex Firm 454g is the improved reformulation of the classic Super Sculpey, designed for sculptors and prototypers who need maximum detail retention before baking and an unbreakable, slightly flexible piece after curing. Its neutral stone-grey colour makes it easy to read lights and shadows during sculpting, and its "Flex Firm" formulation combines the professional firmness of grey Sculpey with an impact resistance that sets it apart from any conventional polymer clay.
Technical specifications
| Parameter | Value |
|---|---|
| Material type | Polymer clay (PVC plastisol), Flex Firm formulation |
| Colour | Stone grey / neutral grey |
| Net weight | 454 g (1 lb) |
| Consistency before baking | Extra firm — holds detail without deforming |
| Baking temperature | 130 °C (275 °F) |
| Baking time | 15 min per 6 mm of maximum thickness |
| Finish after curing | Unbreakable (shatterproof), impact-resistant, with flexibility |
| Post-cure treatment | Sanding, drilling, carving and painting with water-based acrylics |
| Air drying | No — heat only |
| Toxicity | Non-toxic |
What it is used for
- High-precision sculpture with fine details that require the clay not to deform during work.
- Creating prototypes, masters and moulds for production silicone moulds.
- Articulated figures or pieces with thin sections that need strength and structural integrity after curing.
- Prosthetics and special effects (SFX) pieces that require post-bake flexibility to withstand continued use.
- Carving and surface finishing after baking: fine sanding (grit 400–1200), drilling and inlays.
How to use it
- Condition the clay: knead the block until it is smooth and uniform. Due to its extra firmness, you can warm it briefly between your hands or with a heat gun at low temperature to make initial conditioning easier.
- Sculpt with precision: use fine-tipped sculpting tools to carve and define every detail. The extra firmness prevents edges from giving way or sinking under tool pressure.
- Reinforce thin sections: in slender appendages such as fingers, ears or horns, insert coated armature wire as a core before sculpting the Flex Firm over it.
- Bake correctly: preheat a conventional oven to 130 °C and bake for 15 minutes per 6 mm of maximum thickness of the piece. Do not use a microwave under any circumstances.
- Finish the surface: once the piece is completely cool, sand with 400–800 grit paper to smooth it, drill any assembly points you need, or apply water-based acrylic paint directly onto the cured surface.
Important: always bake in a conventional oven with a calibrated thermometer. Temperatures above 175 °C can cause material degradation and release irritating vapours. Work in a well-ventilated space and do not use the same kitchen utensils for baking food. Keep the product out of the reach of children under 8 years of age.
Usage tips
Adjust firmness by blending with other Super Sculpey
Blend Flex Firm with Super Sculpey Beige in different proportions to achieve the exact degree of firmness your project requires: the more Beige you add, the softer and more malleable the resulting mix will be; the more Flex Firm, the harder and more resistant. This technique allows you to fine-tune consistency very precisely without resorting to external plasticisers.
Repair baked pieces without losing strength
If an already-cured piece breaks or cracks, apply raw Flex Firm directly onto the damaged area and bake again at 130 °C for 15 minutes. The resulting bond is, in most cases, stronger than the original material, making this method a definitive repair rather than merely a cosmetic one.
Embed materials before baking
You can insert metal, wood, glass or magnet pieces into the raw clay before placing the piece in the oven. Flex Firm bonds firmly to these inclusions during curing, creating solid assemblies without the need for additional adhesives. Make sure the embedded materials can withstand the 130 °C of the process.
Frequently asked questions
How does it differ from Super Sculpey Beige or Firm Gray?
Flex Firm incorporates an updated formulation that adds post-bake flexibility and impact resistance without sacrificing the characteristic firmness before baking. Super Sculpey Beige is noticeably softer and smoother, ideal for organic modelling with fine detail but with less structural rigidity. Firm Gray has similar firmness before curing, but lacks the "flex" component that makes Flex Firm especially suitable for pieces that must withstand bending or impacts in real use.
Can it be sanded to achieve a smooth finish?
Yes. Start with 220–400 grit wet sandpaper to remove tool marks and ridges, then progress to 800–1200 grit for a very smooth surface. The final result is comparable to polished ceramic and readily accepts priming, airbrushing or direct acrylic paint application.
Does it work with an airbrush or resin paints?
Yes. The cured surface of Flex Firm accepts airbrushing well, whether primed with acrylic gesso or unprimed. It is also compatible with conventional acrylics and water-based polyurethane paints. For solvent-based paints, apply a thin coat of gesso or acrylic primer before painting to prevent the solvent from attacking the surface.
Can I bake large pieces without them cracking?
Yes, as long as you follow two key rules: keep the thickness as uniform as possible throughout the piece, and use internal armature (coated aluminium or steel wire) in bulky areas. A conventional oven with a stable temperature and no sudden changes considerably reduces the risk of cracking. Allow the piece to cool inside the switched-off oven to avoid thermal shock.
No reviews
Tap to zoom
