Monster Clay Grey – Reusable Sulphur-Free Modelling Clay for Sculpting & Special Effects

Premium Sulphur-Free Oil-Based Modelling Clay for Sculpting, Special Effects and Mould Making

Monster Clay® Grey is a reusable, sulphur-free oil and wax-based modelling clay from The Monster Makers, made for professional sculpting. According to the manufacturer, it is made entirely from non-toxic, food-grade components and has an ultra-smooth texture, a low melting temperature and low tack: it does not stick to tools or fingers. At room temperature Monster Clay is firm enough for fine detail; slightly warmed, it stretches like toffee. Because it is sulphur-free, you can mould it directly with platinum (addition-cure) silicones. Monster Clay melts at approx. 57 °C into a pourable mass and becomes solid again on cooling, without any change to its composition. You can choose Soft, Medium or Hard, each in a 2.05 kg (4.5 lbs) block in a reusable, ovenproof tub.

Key Benefits

• Sulphur-free: compatible with platinum (addition-cure) silicones – mould your sculpture directly without inhibiting the silicone cure.
• Never dries out: non-polymerising and non-oxidising – the clay does not become brittle and can be reused endlessly.
• Melts at approx. 57 °C: pourable at around 66 °C – ideal for casting copies of life casts or prototypes and refining them afterwards.
• Low tack: does not stick to tools or fingers – for clean, precise detailing.
• High elasticity: stretches like toffee when warm – for shapes that are difficult with other clays.
• Approx. 25% more clay per kilo: lower density than standard oil-based clays – you get more out of the same weight.

Typical Applications

• Sculpting and modelling figures, busts and creatures
• Special effects, masks and props for film, theatre and cosplay
• Master models for moulding with silicone, alginate or polyurethane
• Casting the clay into flexible moulds for copies of life casts and prototypes
• Models for resin moulds and for 3D scanning and printing
• Prototypes for stop-motion figures

Processing Instructions:

1. Choose the hardness that suits your project: Soft for rough shapes, Medium for general use and Hard for sharp detail. You can blend the grades for an intermediate hardness; once mixed, they cannot be separated.
2. Warm the clay to soften it, for example under a heat lamp or in the oven. Place the tub on a baking tray in the oven, never directly on the rack. The clay is comfortable to knead up to 46 °C.
3. Sculpt with your hands, modelling tools or texture stamps. Warm small areas locally with a hairdryer.
4. Smooth the surface with 99% isopropyl alcohol, citrus solvent or odourless mineral spirits.
5. Want to cast? Melt the clay (melting point approx. 57 °C, optimal pouring at around 66 °C) and stir regularly while melting so the components do not separate. Pour into a silicone, alginate or polyurethane mould; no release agent is needed. Never heat above 82 °C.
6. Let the clay cool for 15 to 30 minutes, briefly in the fridge if you like. Reuse leftovers as often as you want.

Please Note

• Never heat the clay above 82 °C or over an open flame. Overheated clay can separate, release oil or smoke; discard clay that has discoloured or changed.
• We advise against using a microwave: the clay melts from the inside, so you cannot see hot, molten clay. This can cause serious burns and a fire hazard.
• Wear heat-resistant gloves and safety glasses when working with molten clay. Cool skin that has come into contact with hot clay immediately with plenty of cold water.
• Not intended for children under 18, not suitable for consumption and not for direct use on the skin or for prosthetics.
• Monster Clay does not cure and deforms in heat and sunlight. Use a work mat, as the clay can stain porous surfaces.
• Store the clay closed, cool and dry, out of direct sunlight. Stored this way, it keeps for at least 5 years.

Manufactured by The Monster Makers, Inc. of Cleveland (Ohio, United States), specialists in materials for special effects, masks and sculpting since 1991.

Professional Support

Not sure which hardness best suits your project, or which silicones you can use to make a mould? Email us at info@siliconesandmore.com and we will be happy to help.