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Polyurethane Resin

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  1. Jewel-R-Rezin 8-OZ Kit

    Jewelry Resin - Jewel-R-Rezin

    Starting at: $24.95

    One of the best jewelry resins is Jewel-R-Rezin is a professional grade, optically clear jewelry resin used for both jewelry making and encapsulation. Learn More
  2. KastEZ Resin for Easy Casting - 2 Part Polyurethane

    KastEZ Resin for Easy Casting

    Starting at: $24.95

    Kast Ez Resin is a two-part polyurethane casting system. KastEZ Resin is mixed one-to-one by volume and cures at room temperature. Learn More
  3. AquaClear Clear Casting Resin

    AquaClear Clear Casting Resin

    Starting at: $43.95

    AquaClear resin is a non-yellowing, UV resistant, optically clear casting resin. AquaClear casting resin has a working life of 16 minutes and a demold time of 24 hours. Makes beautiful lifecastings. Learn More
  4. Por-a-Kast II Polyurethane Casting Resin

    Por-A-Kast II

    Starting at: $51.95

    Por-A-Kast II is a room-temperature curing urethane casting material that is excellent for casting special effects, artwork from either rigid or flexible molds. Learn More
  5. EnvironMolds Casting Resin

    EnvironMolds Casting Resin

    Starting at: $21.95

    Environmolds' Pourable Casting Resin is a room-temperature curing urethane casting material that is excellent for casting special effects, artwork from either rigid or flexible molds. Learn More
  6. Example using Clear Casting Resin

    Clear Casting Resin

    Starting at: $27.95

    Clear Casting Resin a non-yellowing, UV resistant, optically clear casting resin. Clear casting resin has a working life of 16 minutes and a demold time of 24 hours. Makes beautiful lifecastings. Try a 2-quart kit. See details here . Learn More
  7. Another example using PanoCast 160

    PanoCast 160 Increases Castings by 160%

    Starting at: $45.95

    Increase the size of your casting by 160% Using this specially formulated urethane. Submerge the casting in water and it magically increases uniformly in size. Learn More

Casting Resin Types

Casting resins fall into three classes, polyester, epoxy and polyurethane resins. Polyester resin is most commonly used in the construction of molded reinforced fiber and composite products, so its mechanical properties are reinforced with the fiberglass itself. The polyester resin used in the molding application is a viscous liquid (like honey) requiring the addition of catalysts and accelerators to complete the curing process. Polyester resins are contact products which require no pressure to cure and can be cured from a fluid or solid state.  There are a number of safety issues in using polyester resin as it can be dangerous with its very noxious odor. The user must wear a respirator and work with a hood or in a well ventilated area. In addition, it is not UV light resistant which will cause it to yellow with time. Because it does cure very hard, polyester resin projects may break if dropped on a hard surface.

The advantage of polyester resin is that it is easy to use and is the lowest cost resin among resin products. However, there are a number of critical disadvantages in that the resin without the addition of fiberglass has poor mechanical properties, it’s emission during use in open molds is considered carcinogenic and it has a high and unpredictable shrinkage rate.

Most of us are familiar with polyester resin as it is the binder in fiberglass products – it is the polyester resin that produces the distinct and often off putting odor of fiberglass. Because of its health hazards we do not offer this product.

Though a respirator is not needed while using epoxy resins, epoxy resins get more expensive the clearer you want your finished casting to be. Unlike faster setting polyurethane resins, epoxy resins can take from several hours to several days to completely cure.

Polyurethane Casting Resins

Then there are polyurethane casting resins. They are fast setting and our product offerings do not need a respirator as they are very low in odor emission. These polyurethane casting resin products are two-part, 1-to-1 mix ratio formulas that set from 5 to 20-minutes. The two varieties offered here are opaque and a water clear resin. The opaque resins set to an ivory color in approximately 5-8 minutes. The clear casting resins require more setting time up to about 25-minutes. The advanced formula clear resins set with fewer air bubbles than most available formulas. We even offer a unique polyesher resin formula that will expand (point up) your castings up to 160%

However, no water clear polyurethane casting resin is completely bubble free. Therefore, the use of a pressure pot is recommended to perfect the casting without bubbles. The advantage of polyurethane resins over polyester resins is that these formulas are very low in odor compared to carcinogenic producing smells of polyester resins.

Polyurethane Casting Resins for Cold Casting

Our polyurethane resins are also the perfect choice for cold casting when combined with our metal, stone and wood powders to create beautiful cold castings that exhibit the realistic look of rich metals, stone and wood..

As a caution, polyurethane is very moisture sensitive. It will not cure well in humid climates or in molds that contain water.  You can color polyurethane before casting using our Circius Polyurethane Dyes.