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What is casting resin?
Casting resin is a thin polymer that’s used for casting parts and items. Resin comes in two containers: Part A and Part B. Part A is the casting resin itself, while Part B is the resin hardener that’s needed to cure the cast. The hardener makes the resin cure rapidly so that you can create a greater number of casts in a shorter amount of time.
AeroMarine urethane casting resin has a low odor and is safe to mix at home. Make sure you mix your casting resin in a well-ventilated space so you’ll avoid overexposure to fumes.
How do you cast resin?
Urethane casting resin is great for casting:
- Electronic assemblies
- Fishing lures
- Taxidermy applications
- Industrial parts
Spray your mold with urethane mold release and let it sit for a few minutes for the air bubbles to evaporate. This will help extend the life of the mold and allow for an easier release for the cast. Mix Part A and Part B in an equal ratio of 1:1. Only mix the resin in a clean, plastic container—paper cups and wooden instruments contain moisture that may negatively impact the polyurethane. Avoid mixing less than 3 ounces of the solution, because small batches don’t generate enough heat to cure properly. Likewise, don’t mix batches that are too large until you’re familiar with the product. The casting resin that’s stuck to the side of the container might not get mixed thoroughly, so pour the product into a second plastic container and mix one more time.
Once you’ve stirred the solution, let it sit for a few minutes to let the air bubbles rise to the surface, and then pour the product into your mold. Your part will take 15-30 minutes to harden depending on which urethane resin you used.
We offer FREE technical advice!
Call us at 1-877-342-8860
If you need help choosing the right casting resin for your application or determining the right amount of to get, we offer free technical advice for all products! Browse AeroMarine Products’ collection of offerings, including 2 part marine epoxy, food-grade RTV mold-making silicone, and silicone potting compounds.
Urethane Casting Resin FAQ’s:
What molds are best for resin casting?
Silicone molds are the best molds for use with urethane resin casting. Place cardboard or plastic around your original and pour the rubber silicone over it. When the silicone cures, carefully remove the original and you’ll have an accurate mold in which to pour your casting resin. Urethane casting resin will not stick to AeroMarine silicone molds, so you’ll easily be able to remove your cured resin without damaging your mold.
AeroMarine has a wide array of resins as well as silicones to make molds in a variety of sizes. Our silicones are durable and tear-resistant so you’ll be able to use them again and again.
What is the bronze powder used for?
AeroMarine Products also offers a bronze powder that can be added to the urethane casting resin in 1 part bronze powder, 1 part casting resin, to create cold cast bronze products. This is actual bronze that can be polished when finished.