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 Plastic - Pint Unit

Smooth-Cast 300 - Bright White, Ultra Low Viscosity Liquid Plastic - 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

⚡Ultra-fast 10 min cure time

🎨Bright white, paint-ready finish

💧Ultra-low 80 cps viscosity

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€ 64.06

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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Details

Brand
Smooth-On
Grit Material
Plastic
Grit Type
Fine

Description

⚡ Cast Fast, Finish Flawless — Be the Maker Everyone Envies!

PRO LEVEL FINISH - Bright white resin delivers a clean, professional look that’s ready for customization and display.
DURABLE MACHINABLE - Shore 70D hardness ensures tough, long-lasting parts that you can sand, machine, and paint.
MIX MOLD IN MINUTES - 1:1 volume mix ratio with a quick 3-minute pot life keeps your workflow seamless and efficient.
BUBBLE FREE BRILLIANCE - No vacuum degassing needed—achieve flawless, bubble-free castings every time.
VERSATILE COMPATIBILITY - Works perfectly with glass, metal, plastic, stone, and wood molds for limitless creative freedom.

Smooth-Cast 300 is a professional-grade, ultra-low viscosity liquid plastic resin that cures in just 10 minutes to a bright white, durable Shore 70D finish. Its 1:1 mix ratio and no-need-for-vacuum degassing formula make it ideal for fast, bubble-free castings compatible with a wide range of mold materials.

Specifications

ASIN	B004BN7G0E
Best Sellers Rank	#13,361 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #132 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 1,314 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	1.0 Count

Reviews

N**X

16.12.2023

M**E

13.12.2025

V**E

15.10.2025

B**N

18.12.2024

R**W

12.04.2025

M**S

9.02.2025

B**N

11.09.2025

G**0

23.12.2025

S**E

21.05.2022

M**O

2.12.2021

J**A

17.07.2024

N**X

21.04.2022

J**F

14.01.2026

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