CosClay - The Flexible Polymer Clay Revolutionizing Sculpting
CosClay represents a breakthrough in polymer clay technology. This hybrid plastic/rubber polymer clay maintains flexibility after curing, solving one of the biggest challenges sculptors face with traditional polymer clays - brittleness. Whether you’re creating posable figures, stop-motion characters, or delicate sculptures, CosClay’s unique properties open up possibilities that were previously impossible.
What Sets CosClay Apart?
Traditional polymer clays become rigid and brittle after baking, making them prone to breakage and unsuitable for posable pieces. CosClay changes this entirely by retaining flexibility after curing, creating a durable and resilient finished product.
Key Features
Post-cure flexibility - Pieces can be posed and repositioned without breaking
Durability - Resistant to breaking, chipping, and cracking
Non-toxic ingredients - Safe for studio use
Standard curing - Bakes at 135°C like other polymer clays
Versatile applications - From fine detail work to structural pieces
The CosClay Family
CosClay comes in several formulations, each designed for specific applications:
CosClay Sculpt - The original formula, perfect for character sculpting and detailed work. Offers the ideal balance of flexibility and firmness.
CosClay Doll - Specifically formulated for doll making, with a skin-tone color range and properties ideal for jointed dolls.
CosClay Deco - Designed for decorative applications and surface embellishment.
CosClay Elements - Special-effect formulations including translucent and metallic options.
Working with CosClay
Conditioning
Like all polymer clays, CosClay needs conditioning before use. Knead and warm the clay until it’s soft and pliable. A pasta machine dedicated to clay work makes this process much easier.
Sculpting Techniques
CosClay handles similarly to other polymer clays during the sculpting phase:
Detail work - Holds fine details exceptionally well
Blending - Colors can be mixed to create custom shades
Layering - Build up forms gradually for complex pieces
Armatures - Wire armatures work perfectly with CosClay
Tools - Responds well to all standard sculpting tools
Curing Requirements
Critical for success: Cure at 135°C for at least 30 minutes per 6.35mm of material thickness. Undercuring will compromise the final flexibility and durability.
Tips for Proper Curing:
Use an oven thermometer to verify temperature
Longer curing times are generally better than shorter
Tent pieces with aluminum foil to prevent browning
Allow pieces to cool completely before handling
Thicker areas may need extended curing time
Applications and Projects
Stop-Motion Animation
CosClay’s flexibility makes it ideal for stop-motion puppets. Characters can maintain poses without breaking, and replacement parts can be easily swapped.
Posable Figures
Create action figures and dolls with moving joints. The flexibility allows for repeated posing without wear or breakage.
Jewelry
Make durable jewelry pieces that won’t snap or crack with normal wear. The flexibility means earrings and pendants can handle impacts.
Cosplay and Props
Build lightweight, durable costume pieces that flex with movement rather than breaking.
Character Sculpting
Create detailed character sculptures with thin areas (like fingers and tails) that won’t break off.
Combining CosClay with Other Materials
Armatures
Wire armatures for posable figures
Aluminum foil bulks for larger pieces
Wood or metal structural supports
Mixed Media
Can be painted with acrylics after curing
Accepts most adhesives once cured
Can be sanded and carved
Compatible with varnishes and sealers
Advanced Techniques
Creating Joints
CosClay’s flexibility allows for several jointing methods:
Ball-and-socket joints using the clay itself
Wire-through construction for simple joints
Hybrid joints combining rigid and flexible elements
Thin Applications
Unlike traditional polymer clays, thin areas in CosClay won’t be brittle:
Delicate wings and fins
Thin fabric simulations
Fine hair strands
Translucent elements
Mold Making
CosClay can be used to create flexible molds for casting:
Press molds for textures
Small part duplication
Temporary molds for resin casting
Finishing CosClay Projects
Surface Preparation
Light sanding with fine-grit sandpaper for smooth finishes
Can be carved and detailed after curing
Wash with soap and water before painting
Painting
Acrylics work exceptionally well
Prime with gesso for best paint adhesion
Multiple thin coats better than single thick coats
Flexible paints and mediums recommended
Sealing
Water-based varnishes (matte, satin, or gloss)
Flexible sealers maintain the clay’s properties
Multiple thin coats for best results
Tips for Success
Don’t underbake - Proper curing is essential for flexibility
Test your oven - Oven temperatures can vary significantly
Start small - Practice with small projects before tackling complex pieces
Mix colors carefully - Colors lighten slightly when baked
Store properly - Keep unused clay wrapped and away from heat
Clean hands frequently - Prevents unwanted color mixing
Use fresh clay - Old clay may not cure with optimal flexibility
Troubleshooting
Clay too soft: Leach between sheets of paper for 24 hours to remove excess oils.
Clay too firm: Add a few drops of mineral oil or clay softener and condition thoroughly.
Pieces cracking: Usually indicates undercuring. Ensure proper temperature and time.
Lost flexibility: Check curing temperature and time. Overbaking at too high temperature can affect properties.
Storage and Shelf Life
Store CosClay in a cool, dry place away from direct sunlight. Properly stored, it has a shelf life of several years. Keep colors separated to prevent unwanted mixing.
CosClay has fundamentally changed what’s possible with polymer clay. Its unique flexibility after curing makes it the go-to choice for any project requiring durability and movement. Whether you’re a stop-motion animator, doll maker, or sculptor, CosClay offers properties that traditional polymer clays simply cannot match.
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