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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R6407

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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, paintable, and resistant to moisture and mild solvents.
TRUSTED BY CREATORS - Top-rated with 4.7 stars from over 1,300 users—join the community of pros who rely on Smooth-Cast 300.
PERFECT MIX EVERY TIME - Convenient 1A:1B mix ratio simplifies preparation and reduces waste.
SPEED MEETS EFFICIENCY - Quick 3-minute pot life and 10-minute cure time keep your projects moving fast.
EFFORTLESS PRECISION CASTING - Ultra-low viscosity ensures bubble-free, bright white results without vacuum degassing.

Smooth-Cast 300 is a premium ultra-low viscosity liquid plastic resin designed for bright white, virtually bubble-free castings. With a fast 10-minute cure time and easy 1:1 mix ratio, it delivers durable, machinable, and paintable results resistant to moisture and mild solvents—ideal for professional-grade molding and casting projects.

Specifications

ASIN	B0742MBCH3
Best Sellers Rank	#15,173 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #144 in Sculpture Molding & Casting Products
Customer Reviews	4.7 4.7 out of 5 stars (1,319)
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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