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 Liquid Plastic Urethane Casting Resin - Trial Unit

Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit

Product ID: 48505789

Details

Brand
Smooth-On
Grit material
Plastic
Grit type
Fine
Item dimensions L x W x H
18.8 x 15.2 x
Material
Urethane

💧ultra low viscosity

⏱️15 min fast cure

⚖️1:1 mix ratio

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KSh29973

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In stock

Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Cast like a pro, cure like a boss!

RAPID 15 MINUTE CURE - Get flawless, durable castings faster than ever—perfect for tight deadlines.
EFFORTLESS 1 1 MIX RATIO - Simplify your workflow with an easy, precise equal-part mixing system—no guesswork needed.
ULTRA LOW VISCOSITY FLOW - Pour with ease and achieve bubble-free, bright white results every time—no vacuum degassing required.
MOISTURE SOLVENT RESISTANT - Create tough, long-lasting pieces that stand up to everyday wear and tear.
VERSATILE FINISH READY MATERIAL - Sand, prime, and paint your castings to perfection for professional-grade prototypes and props.

Smooth Cast® 300 is a premium liquid urethane resin designed for ultra-low viscosity, fast 15-minute curing, and a simple 1:1 mix ratio. It produces bright white, rigid, and durable castings that require no vacuum degassing and can be easily sanded, primed, and painted—ideal for sculptors, prototypers, and special effects artists seeking flawless, professional results.

Specifications

ASIN	B004BN7G0E
Best Sellers Rank	776,390 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 2,437 in Sculpting Moulding & Casting
Brand	Smooth-On
Compatible Material	Plastic
Customer Reviews	4.7 4.7 out of 5 stars (1,125)
Grit Material Type	Plastic
Grit Number	300
Grit Type	Fine
Item Dimensions	18.8 x 15.2 x 7.9 centimetres
Item Weight	907 g
Manufacturer	Smooth-On, Inc.
Manufacturer Part Number	47641
Material	Urethane
Model Number	47641
Number of Items	1
UPC	751635476417
Unit Count	1.0 count

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How is product pricing calculated?+

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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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KSh29973

Duties & taxes included

In stock

Sold byAmazon KenyaDelivered 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 Kenya.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Anjali K.

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

1 month ago

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