Can I add glitter to this?

I've used 325 with glitter pigments, and it works very well. You'll have to add a decent amount of glitter and it will take longer to cure.

Can I use this to cast a dome-shaped mask using a silicone mold? Will it stay liquid long enough for me to tilt it back & forth to form an even coat?

Smooth-Cast 300 is a snap cure material - a better choice may be Smooth-Cast 325 or Smooth-Cast 65D, both of which have a gradual cure profile.

Yeah, to an extent. I’ve taken a dremle tool to casted plastic to sand down parts and remove unwanted flashing that occurs. It’s pretty tough stuff, let it cure for a day or two before sanding or working on thinner areas, but I’ve even taken a hacksaw to some castings and they have held up just fine.

Is this a silicone or a urethane?

This is a urethane casting resin.

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Smooth-Cast 300, Bright White, Ultra Low Viscosity Liquid, Pint Unit

Smooth-Cast 300, Bright White, Ultra Low Viscosity Liquid, Pint Unit

Product ID: 1871175

Details

Brand
Smooth-On
Grit Material
Plastic
Grit Type
Fine
Item dimensions L x W x H
7.4 x 6 x 3.1
Material
Plastic

⚪Bright white, ultra-low viscosity

🔧Shore 70D hardness, machinable

⏱️3-min pot life, 10-min cure

€ 90.15

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Cast Fast, Finish Flawless – The Pro’s Choice for Bright White Perfection!

MIX GO SIMPLICITY - 1:1 volume mixing ratio means no special tools—trusted by artists and pros for consistent, reliable castings every time.
DURABLE MACHINABLE - Cures to a tough Shore 70D hardness—drill, sand, carve, and paint your creations with confidence.
EFFORTLESS PRECISION - Free-flowing resin fills intricate molds with ease, capturing every detail for museum-quality results.
BUBBLE FREE BRILLIANCE - Ultra-low viscosity formula lets air escape naturally, delivering smooth, professional-grade finishes without vacuum degassing.
LIGHTNING FAST CASTING - Get flawless, bright white castings in just 10 minutes—perfect for rapid prototyping and production sprints.

Smooth-Cast 300 is a professional-grade, ultra-low viscosity two-part polyurethane resin that cures bright white, bubble-free castings in just 10 minutes. With a 3-minute pot life and Shore 70D hardness, it offers rapid production, exceptional detail capture, and machinability. Its easy 1:1 mix ratio and compatibility with silicone molds make it a top pick for artists, designers, and manufacturers seeking high-quality, durable castings without the hassle of vacuum degassing.

Specifications

ASIN	B004BN7G0E
Best Sellers Rank	#13,022 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #119 in Sculpture Molding & Casting Products
Brand	Smooth-On
Brand Name	Smooth-On
Compatible Material	Glass, Metal, Plastic, Stone, Wood
Customer Reviews	4.7 out of 5 stars 1,321 Reviews
Grit Material	Plastic
Grit Material Type	Plastic
Grit Number	300
Grit Type	Fine
Item Dimensions	7.4 x 6 x 3.1 inches
Item Type Name	Casting Resin
Item Weight	2 pounds
Item dimensions L x W x H	7.4 x 6 x 3.1 inches
Manufacturer	Smooth-On, Inc.
Material	Plastic
Material Type	Plastic
Model	47641
Number of Items	1
Part Number	47641
UPC	751635476417
Unit Count	1 Count

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€ 90.15

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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