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 - Gallon Unit

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

Product ID: 45788979

⚡Ultra-low viscosity for flawless pours

🎨Bright white, paint-ready finish

⏱️Fast 10-minute cure time

$490.72

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Description

⚡ Cast fast, cast flawless — join the pros who never settle for less!

SPEED MEETS EFFICIENCY - Quick 3-minute pot life and 10-minute cure time keep your projects moving
PERFECT MIX EVERY TIME - Convenient 1A:1B ratio eliminates guesswork and waste
DURABILITY YOU CAN TRUST - Fully cured castings are tough, machinable, and moisture resistant
EFFORTLESS PRECISION CASTING - Ultra-low viscosity ensures bubble-free, smooth pours every time
READY FOR YOUR CREATIVE TOUCH - Bright white finish is ideal for painting and finishing with ease

Smooth-Cast 300 is a bright white, ultra-low viscosity liquid plastic resin designed for bubble-free, high-detail castings without vacuum degassing. With a simple 1:1 mix ratio, a rapid 3-minute pot life, and a 10-minute cure time, it delivers tough, durable, and paintable castings ideal for professional and creative projects alike.

Specifications

Best Sellers Rank	#13,380 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #128 in Sculpture Molding & Casting Products
Customer Reviews	4.7 out of 5 stars 1,318 Reviews

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$490.72

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Very reliable shop with genuine products. Will definitely buy again!

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The product quality is outstanding. Exactly what I needed for my work.

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