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Fast Set Tooling / Prototyping Urethane Kit
Fast Set and Heat Resistant


How to Cast Fast Set Urethanes Video
#4113 Fast Set Tooling / Prototyping Urethane Kit is a two-part urethane casting system for molds or parts. This metallic grey urethane cures rapidly, so it can be mixed, poured, and demolded very quickly. Most castings made with #4113 Fast Set Tooling / Prototyping Urethane Kit can be demolded in 30 to 40 minutes and can be put into service within a day. Parts and tools created with #4113 are heat resistant up to 250°F.

With low shrinkage and low exotherm during cure, this stable urethane kit is ideal for making medium to large complicated casts. Use this smooth, easy-pour system to quickly create tooling, patterns, molds, fixtures, and much more. This urethane has outstanding cured properties including: heat resistance, exceptional hardness, and excellent cured stability.

#4113 Fast Set Tooling / Prototyping Urethane Kit has a simple 1:1 mix ratio by weight or volume. Once mixed, this urethane has a 5-6 minute pot life. Pour the urethane very slowly to aid the release of air bubbles. When using #4113 Fast Set Tooling / Prototyping Urethane Kit, avoid water and all types of moisture contamination. Do not use this urethane kit with PVA Release Film. To ensure a proper release from a mold, use at least four layers of #4121 Non-Silicone High Temp Paste Wax.
  • Mix Ratio – 1:1 (by weight and volume)
  • Color – Gray
  • Pot Life, 4 fl. Oz. Mass, @ 77°F – 5-6 minutes
KEVLAR® / Carbon Hybrid (Blue)
5.4 oz/sq yd, 50" Wide, 0.012" Thick, 2x2 Twill Weave


Get the best of both worlds with this KEVLAR® and carbon hybrid. By combining the properties of both materials in each layer, this First Quality fabric delivers a high strength-to-weight ratio, high conformability, impact resistance, abrasion resistance, dimensional stability, and fatigue resistance.

3K Carbon creates the warp and 1420 Denier KEVLAR® is dyed blue and used in the fill direction, making for easy drape and impressive cosmetics. Use as a single layer for cosmetics or back with another layer in the cross direction for a maximum balance of properties.

This hybrid is compatible with polyester and vinyl ester, but use with an epoxy resin system to maximize the strength properties of the carbon fiber. Store any unused fabric away from UV light.

Fibre Glast is committed to ensuring that every roll of fabric we handle is First Quality and manufactured to the highest standards, so you should expect the same properties and handling characteristics every time you order.

KEVLAR® Fabric is made with genuine DuPont™ KEVLAR® fiber. DuPont™ and KEVLAR® are registered trademarks of E.I. du Pont de Nemours and Company and are used with permission.
KEVLAR® Plain Weave Fabric
5.0 oz/sq yd, 50" Wide, 0.011" Thick, KEVLAR® Plain Weave Fabric


KEVLAR® in plain weave form is the most popular KEVLAR® in composites. Although it is slightly stiff for highly contoured molds, it offers uniform properties, maximum stability, and simple surfacing characteristics. Its good stiffness, light weight, and high abrasion resistance make it a great selection for applications that include kayaks, canoes, high-speed boats, aircraft fuselage panels, pressure vessels, sporting equipment, wind turbines, and much more. Generally, though, KEVLAR® is not suited for applications that call for compressive strength. It is meant to be used with a resin system, like our System #2000 epoxy.

Before starting your project with this KEVLAR® fabric, consider:
  • KEVLAR® is difficult to cut, sand, and machine. Consider a dedicated pair of serrated scissors, like our #1731-A.
  • Our KEVLAR® is not meant to be sewn.
  • Unused KEVLAR® should be stored away from UV light.


Fibre Glast is committed to ensuring that every roll of fabric we handle is First Quality and manufactured to the highest standards, so that you can expect the same properties and handling characteristics every time you order.

KEVLAR® Fabric is made with genuine DuPont™ KEVLAR® fiber. DuPont™ and KEVLAR® are registered trademarks of E.I. du Pont de Nemours and Company and are used with permission.
Woven Fiberglass Tape
7.5–10 oz/sq yd, Various Widths, 0.015" Thick, 18 x 17 Plain Weave


Woven Fiberglass Tape is ideal for selective reinforcement of fiberglass laminates, sleeve or pipe winding, seams, and molding.

These tapes are referred to as tapes only for their width and appearance—they are not adhesive backed. Their finished edges offer easier handling and a clean, finished appearance, and keep the tape from unraveling.

Tapes are matched to our #243 and #245 fabrics (7.5–10 ounce fabrics). Their plain weave construction builds in uniform strength in both horizontal and vertical directions.

Tapes are meant to be used with a resin, they saturate easily, and are compatible with epoxy, polyester, and vinyl ester.

With the Fibre Glast First Quality commitment, you can expect the same finish, sizing, and handling characteristics every time you order this tape.

Typical full roll length is 50 yards.
Polyester Fairing Compound
Creamy Non-Sag Fairing Compound


Polyester Fairing Compound is a fibrous filler for structural repairs, bonding, and part fabrication. This smooth, white, thixotropic paste system is great for rebuilding broken, void, or damaged areas in composites and other materials. Unlike other body fillers, #4100 Polyester Fairing Compound exhibits low shrinkage, high impact strength, and excellent temperature and chemical resistance. It also has great heat and cold resistance and no bleed out. It is easy to mix, has excellent adhesive qualities, low moisture absorption, and can be applied in varying degrees of thickness. Use this versatile Polyester Fairing Compound to permanently repair damage on a boat or to smooth and shape the external surface of a part.

Using this fairing compound is simple. After prepping the surface mix #4100 with a BPO Hardener. Our kits ship with white BPO hardener, however you may want to purchase either Red or Black as an off-color mix indicator. When mixing is finished, the fiber-filled paste can be applied and smoothed with a squeegee or spreader. If your application requires a perfectly smooth cosmetic surface, after using #4100 Polyester Fairing Compound, we recommend using our #4116 Lightweight Polyester Cosmetic Filler.

#4100 is Compatible with Epoxy Resin, Polyester Resin, and Vinyl Ester Resin.
Requires BPO Hardener - 100R:2H (parts by weight).

To get the best mechanical bond, it is recommended to use #4100 Polyester Fairing Compound on rough or fibrous surfaces. Bonding applications include: composite repair, marine fabrication, FRP composites to FRP, metal inserts to fiberglass, metal to concrete, detail blocks to FRP, wood to wood bonding, and metal to metal bonding.

4100/264-A Kit contains 1 Quart Polyester Fairing Compound & 1 oz. tube of White BPO Hardener.
4100/264-B Kit contains 1 Gallon Polyester Fairing Compound & 4 oz. tube of White BPO Hardener.
  • Resin Color – White
  • Working Time (100 gram mass) – 8-10 minutes
  • Finish Schedule (100 gram mass) – 15-30 minutes
  • Cured Hardness – 80-83 Shore D
Urethane Casting Resin - Shore A
Create Flexible Parts or Molds


Pour tough, flexible parts and molds with Urethane Casting Resin Shore A. Available in two hardness variations, 40 Shore A and 60 Shore A. These urethane casting resins make it easy to create softer more resilient parts and tooling. These urethane casting resins have been designed specifically for the pouring of prototype and production parts. They can also be used to create fast flexible molds with good life. They offer some undercut or negative draft. While silicone can be used to create more flexible and lower cost molds, Urethane offers superior tear strength and offer 3-4 times the mold life. Shore A resins can accept pigments to achieve opaque colors in finished castings. These Urethanes are used in many common mainstream products, but are especially popular in automotive applications.

When mixed thoroughly, pour the urethane slowly to aid the release of any air bubbles. When using Urethane Casting Resin Shore A kits, avoid water and all types of moisture contamination. Do not use any urethane kit with PVA Release Film, and do not mix with wooden mixing sticks. #2333 Plastic Paint Stirrers for Urethanes are recommended. To ensure a proper release from a mold, use at least four layers of #4121 Non-Silicone High Temp Paste Wax.

Urethane Casting Resins with Shore A hardness can completely cure at room temperature, but can also be heat cured up to 150°F for faster production rates.

    #3340 Urethane Casting Resin 40 Shore A
  • Mix Ratio (by weight) – 100:75
  • Color – Light Amber
  • Working Time, 4 fl. Oz. mass @ 77°F – 25 minutes
  • Demold Time
    (75°F) – 2.5 - 3 hrs
    (150°F Cure) – 30-40 minutes
    #3360 Urethane Casting Resin 60 Shore A
  • Mix Ratio (by weight) – 100:55
  • Color – Light Amber
  • Working Time, 4 fl. Oz. mass @ 77°F – 15 minutes
  • Demold Time
    (75°F) – 2 – 2.5 hrs
    (150°F Cure) – 30-40 minutes
Labyrinth - 3k, 12x12 Carbon Fiber Fabric
5.7 oz/sq yd, 50" Wide, 0.014" Thick, 3K, 12x12


Laminating this carbon fabric brings its pattern to life. Almost like an optical illusion, it appears like a maze of cubes zigzagging across the length of the fabric. This style is ideal for applications that call for the ultimate tensile strength and stiffness of carbon, and cosmetics that might be slightly different every time you take a look.

This fabric must be used with a resin. To maximize strength properties, use an epoxy, like our System #2000.

A single layer of the Labyrinth can also be used with standard carbon fabric or even fiberglass.

Fibre Glast is committed to ensuring that every roll of fabric we handle is First Quality and manufactured to the highest standards, so that you can expect the same properties and handling characteristics every time you order.
Clear Urethane Casting Resin
Excellent Clarity and Durability


#3500 Clear Urethane Casting Resin is perfectly water clear and won't yellow with UV exposure like an epoxy would. Also, it won't discolor in high humidity environments. This room temperature cure, two-part casting resin is self leveling and can be poured to create exceptionally rigid, durable, and impact resistant parts in applications that previously used acrylic or polycarbonate.

It is more resilient than clear polyester casting resins, and can be used to create quieter, more durable tabletops than clear epoxy resins. Typical applications include: lenses, clear reproduction parts, decorative pieces, prototype models, tabletops, and encapsulations. This resin can pour castings as shallow as 1/4" up to 3" deep at a time.

When mixed thoroughly, pour the clear urethane slowly to aid the release of air bubbles. It may be necessary to place the mixed resin in a degassing chamber to ensure all air is released to achieve a perfect casting. When using Clear Urethane Casting Resin, avoid water and all types of moisture contamination. Avoid direct contact with wood. Do not use any urethane kit with PVA Release Film, and do not mix with wooden mixing sticks. #2333 Plastic Paint Stirrers for Urethanes are recommended. To ensure a proper release from a mold, use at least four layers of #4121 Non-Silicone High Temp Paste Wax.

If using as a tabletop coating, it is advisable to clean the tabletop surface with alcohol and dry with a heat gun. This will ensure the surface is moisture free. Light heat can also be added to aide in outgassing during the cure cycle. Do not over heat. As a tabletop resin, our #3500 Clear Urethane is quieter than epoxy resins, and will not crack.
  • Mix Ratio (parts by weight) – 100A:72B
  • Work Life (100 gram mass) – 25 minutes
  • Maximum Casting Depth* - 3 inches
    *Castings greater than 3 inches can be step cast
  • Demold Time – 12-16 hours
  • Complete Cure – 5-7 days
  • Cured Color – Optically Water Clear
  • Hardness – 80 Shore D


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