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, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit

Smooth-Cast™ 300: Bright White, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit

Product ID: 1871175

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Details

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

🕒10 min Full Cure

⏱️3 min Pot Life

⚗️Easy Mix Ratio 1A:1B

Description

🎨 Craft Your Imagination with Smooth-Cast™ 300!

NO HASSLE NO FUSS - Forget about vacuum degassing—just mix and pour!
COMPACT AND CONVENIENT - Lightweight design (2 lbs) makes it easy to store and use anywhere.
UNLEASH YOUR CREATIVITY - Transform your ideas into stunning sculptures and props in just minutes!
DURABILITY MEETS VERSATILITY - Enjoy fully cured castings that are machineable and paintable.
PERFECT FOR PROFESSIONALS AND HOBBYISTS - Ideal for prototype models, theatrical props, and arts & crafts.

Smooth-Cast™ 300 is a low viscosity, bright white liquid plastic casting resin that allows for quick and easy creation of durable reproductions. With a simple 1A:1B mix ratio and no need for vacuum degassing, this resin cures in just 10 minutes, making it perfect for artists, designers, and hobbyists alike.