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

R$608

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Cast fast, shine bright, and craft like a pro!

DURABLE MACHINABLE - Rigid Shore 70D hardness lets you drill, sand, carve, and paint your creations with ease.
EFFORTLESS 1 1 MIXING - Simple equal parts mix means no special tools—professional results without the hassle.
BUBBLE FREE BRILLIANCE - Ultra-low viscosity formula naturally releases trapped air—no vacuum degassing needed for pristine surfaces.
LIGHTNING FAST CASTING - Get flawless, bright white castings in just 10 minutes—perfect for rapid prototyping and production sprints.
VERSATILE COMPATIBILITY - Works seamlessly with silicone molds and multiple materials—trusted by artists, designers, and makers alike.

Smooth-Cast 300 is a premium ultra-low viscosity two-part polyurethane resin that cures bright white and bubble-free in just 10 minutes. With a 3-minute pot life and easy 1:1 mixing, it delivers durable, machinable castings at Shore 70D hardness, ideal for professional prototyping, cosplay, and detailed model making.

Specifications

ASIN	B004BN7G0E
Best Sellers Rank	#15,592 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #151 in Sculpture Molding & Casting Products
Brand Name	Smooth-On
Compatible Material	Glass, Metal, Plastic, Stone, Wood
Customer Reviews	4.7 4.7 out of 5 stars (1,319)
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
Manufacturer	Smooth-On, Inc.
Material Type	Plastic
Model	47641
Number of Items	1
Part Number	47641
UPC	751635476417
Unit Count	1 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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R$608

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered 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 Brazil.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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