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, Gallon Unit

Smooth-Cast 300, Bright White, Ultra Low Viscosity Liquid, Gallon Unit

Product ID: 45788979

⏳Fast 10-minute cure time

⚡Ultra-low viscosity for smooth pours

🛡️Durable, moisture & solvent resistant

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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 DEFENSE - 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, fast-curing castings. With a convenient 1:1 mix ratio, a 3-minute pot life, and a 10-minute cure time, it delivers tough, durable, 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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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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397499CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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