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Smooth-Cast 300 Liquid Plastic Compound

by Smooth-On


Perfect for pouring into a rubber mold. Quickly turns from a liquid to a solid, durable plastic. Ideal for duplicating a variety of original models or sculptures. The Smooth Cast 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a one to one mix ratio (one part A to one part B by volume). The differences between them are pot life and demold time. Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast Liquid Plastics include reproducing small to medium size sculptures, cold cast bronze castings, making prototype models, roto cast pieces, special effect props and decorative jewelry. Net weight 32 oz. (909 grams).

Technical Information
Pot Life: 3 minutes
Demold Time (depending on mass): 10 minutes
Shrinkage: .005 in./in.
Color: White Viscosity: 80 cps
S.G. g/cm3: 1.05
S.V. cu. in./lb.: 26.6
Shore D Hardness: 70 Ultimate Tensile Strength: 3,000 PSI

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Smooth-Cast 300 Liquid Plastic Compound

by Smooth-On

Average User Rating: Based on (8 Reviews)

5 8

Angela from OH says:

Great stuff! Had no air bubbles(warming up your mold before pouring resin will help with this) and easy to sand. Finished pieces - best to spray your piece with primer before painting.

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Customer Product Reviews
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Rated by: Angela in OH
Great stuff! Had no air bubbles(warming up your mold before pouring resin will help with this) and easy to sand. Finished pieces - best to spray your piece with primer before painting.
Rated by: Jill C. in Anaheim, CA
I love this stuff. It was exactly what I needed. It was quick and very easy to work with. I only wish that the bottles the liquids came in were a little more pour friendly. I ended up wasting a bit because it would dribble everywhere after poring into the cups I used. Other than that the finished piece of plastic is easily sand-able and I intend to buy more in the future.
Rated by: roger m. in forest lake, MN
This is my first time using any plastic casting. The one to one mixing ratio makes the product just about fool proof. Just remember, be organized, because it starts to set up within a couple of minutes. It machines well too and it is strong. I highly recommend it.
Rated by: Matt A. in Arlington, VA
Excellent stuff, picks up the details very well, and hardens nice and quick. I sometimes make mistakes with mixing evenly and having it gummy, but that is my own fault, GREAT PRODUCT!
Rated by: Jason F. in westminster, CA
This product is incredibly easy to use. It is almost fool-proof using the simple instructions and yields great results. I've tried them ALL and this is THE BEST!
Rated by: Justin C. in Atlanta, GA
This stuff works great. I had a couple problems with it curing completely but being sticky in parts but it's not a fault of the product. Just make sure you mix well.
Rated by: Steven S. in Tallahassee, FL
This stuff is great! Easy 1 to 1 mixing. Picked up all the detail from the smallest parts I was casting. Can quickly be pulled from the mold, you can do several pulls an hour. Easy to work with after pulling it from the mold. Highly recommended.
Rated by: Paul H. in Roseville, CA
Very easy to use,Picks up all the fine detail if you are making a copy of anything for my use it is being used in copies of plastic and diecast model bodies and parts. I think it is a great product.And would recommend it to anyone. Thanks Paul

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