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.

Smooth Cast 300 Bright White Ultra Low Viscosity Liquid Gallon

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Cast Brighter, Cure Faster, Create Stronger!

BUILT TO LAST - Fully cured castings are tough, machinable, and paint-ready for professional finishes
MIX WITH CONFIDENCE - Simple 1A:1B ratio eliminates guesswork and speeds prep
SPEED MEETS EFFICIENCY - Quick 3-minute pot life and 10-minute cure time keep your projects moving
MOISTURE SOLVENT SHIELD - Resistant to moisture and mild solvents, perfect for long-lasting creations
EFFORTLESS PRECISION CASTING - Ultra-low viscosity ensures bubble-free, bright white results every time

Smooth-Cast 300 is a bright white, ultra-low viscosity liquid resin designed for bubble-free castings without vacuum degassing. It features a convenient 1:1 mix ratio, a fast 3-minute pot life, and cures fully in 10 minutes. The resulting castings are durable, machinable, paintable, and resistant to moisture and mild solvents, making it ideal for professional-grade molding and casting projects.

Specifications

ASIN	B0742MBCH3
Best Sellers Rank	#15,831 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #148 in Sculpture Molding & Casting Products
Customer Reviews	4.7 4.7 out of 5 stars (1,321)
Date First Available	July 19, 2017
Item Weight	2 pounds
Item model number	47641
Manufacturer	Smooth-On, Inc.
Product Dimensions	12 x 4 x 15 inches

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