Shell Shock™ FAST

ShellshockFastpint ⓘ A8518CA4-AD3E-A349-AE7C-3DAEE4629982
Polyurethane Resins

Thixotropic plastic that thickens upon mixing and can be brushed without sagging.

  • Mix ratio by volume: 1A:4B

  • Mix ratio by weight: 1A:5B
  • Working time: 3 minutes
  • Demold time: 60 minutes
  • Compatible with  styrofoam , wood, and other surfaces
exclamation.svg health-hazard.svg

Danger

H315 - Causes skin irritation.
H317 - May cause an allergic skin reaction.
H320 - Causes eye irritation.
H332 - Harmful if inhaled.
H334 - May cause allergy or asthma symptoms or breathing difficulties if inhaled.
€ 62.97

(€ 52.04 without 21% VAT)

In stock

Description

Shell Shock™ FAST thixotropic plastic thickens when mixed and can be applied to various surfaces or rubber molds. 

Mix Parts A and B in the correct ratio (1A:4B by volume or 1A:5B by weight) to cure at room temperature with minimal shrinkage, resulting in a hard, durable plastic with good compressive and flexural strength.

Once fully cured, the castings are rigid and can be sanded, primed, and painted.

Color effects can be achieved by adding SO-Strong Color Tints.

  • Ideal for making fast, lightweight rigid molds for silicone appliances and effects, serving as a replacement for stone molds.
  • Can be used as a gel coat in rubber molds, backed with rigid foam for detailed, lightweight castings.
  • Applicable as an impact-resistant coating on styrofoam (polystyrene), which can be sanded, primed, and painted (minimum of 3 coats recommended).
  • Suitable for making rigid support shells for brush-on rubber molds.

Instructions

Preparation

  • All liquid urethanes are moisture sensitive and will absorb atmospheric moisture. Avoid using water-based clays.
  • Use clean mixing tools and containers made of metal or plastic.
  • Store and use materials in a warm environment (22°C).
  • Use materials as soon as possible due to limited shelf life.
  • Mix in a well-ventilated area. Wear safety glasses, long sleeves, and rubber gloves.
  • Conduct a small test application to ensure suitability for your project.
Applying A Release Agent
  • Use Mann’s Ease Release 200 to facilitate demolding. Apply liberally to all surfaces in contact with the plastic.
  • Brush the release agent with a soft brush, then apply a light mist coating. Let dry for 30 minutes.
  • A release agent is not needed when casting silicone into a mold, but it eases demolding and prolongs mold life.
Mixing
  1. Pre-mix Part-B before starting.
  2. Dispense Parts A and B into a mixing container and mix thoroughly for about 1 minute, scraping the sides and bottom.
  3. The material will begin to thicken almost immediately.
Applying
  • Use a clean brush for each layer. Apply layers until the desired thickness is achieved (1 cm recommended for minimum strength).
  • Apply the first coat thinly with a stippling motion to minimize air bubbles.
Curing
  • Ensure adequate ventilation and avoid inhaling fumes.
  • Let castings cool to room temperature before handling.
  • Demold time depends on mass and mold configuration; low mass or thin-walled castings take longer to cure.
  • For rotational or hollow castings, backfill with rigid foam for lightweight reinforcement.
Post Curing
  • Optional post curing increases physical properties. Expose material in the mold to 65°C for 2 hours, then cool to room temperature.
Performance
  • After sufficient layering, the cured material is rigid, hard, and durable.
  • It resists moisture, moderate heat, solvents, and dilute acids, and can be machined, primed, painted, or bonded to other surfaces.
  • Allow the material to cure for at least 4 hours at 23°C before sanding or machining.
  • Use a dust mask when machining to prevent inhalation of particles.
  • Unpainted castings will darken with UV exposure.
  • Conduct a small test application to ensure suitability for your project.

Specifications

Color Beige
Mixed Viscocity 3,000 cps
Cure Time 60 minutes
Pot Life 3 minutes
Flexural Strength 7,150 psi
Flexural Modulus 980,000 psi
Specific Volume 17.3 cu. in./lb.
Specific Gravity 1.60 g/cc
Mix Ratio By Weight 1A:5B
Shrinkage 0.0006 in. / in.
Mix Ratio By Volume 1A:4B
Tensile Strength 3,100 psi
Elongation At Break 0.4 %
Shore D Hardness 85
Heat Deflection Temp 135 °F
Compressive Strength 9,000 psi
Tensile Modulus 435,000 psi
Compressive Modulus 500,000 psi
Available in Polyurethane Resins
Product Color Color Mixed Viscocity Cure Time Pot Life Flexural Strength Flexural Modulus Specific Volume Specific Gravity Mix Ratio By Weight Shrinkage Mix Ratio By Volume Tensile Strength Elongation At Break Shore D Hardness Heat Deflection Temp Compressive Strength Tensile Modulus Compressive Modulus
Shell Shock™ FAST Beige Beige 3,000 cps 60 min. 3 min. 7,150 psi 980,000 psi 17.3 cu. in./lb. 1.60 g/cc 1A:5B 0.0006 in. / in. 1A:4B 3,100 psi 0.4 % 85 135 °F 9,000 psi 435,000 psi 500,000 psi
Shell Shock™ SLOW Beige Beige 3,000 cps 5 h. 8 min. 7,150 psi 980,000 psi 17.3 cu. in./lb. 1.60 g/cc 1A:5B 0.0006 in. / in. 1A:4B 3,100 psi 0.4 % 85 135 °F 9,000 psi 435,000 psi 500,000 psi
Recommended products

Why buy at FormX?

Subscribe to our Newsletter

Stay up to date with the latest offers

Visa logo iDeal logo Mastercard logo Paypal logo FedEx logo FedEx logo
This website has been developed by Usecue B.V.
© 2026 FormX B.V.