---
product_id: 48505789
title: "Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit"
brand: "smooth-on"
price: "฿8175"
currency: THB
in_stock: true
reviews_count: 10
category: "Smooth On"
url: https://www.desertcart.co.th/products/48505789-smooth-cast-300-liquid-plastic-urethane-casting-resin-trial-unit
store_origin: TH
region: Thailand
---

# 15 min fast cure paintable & machinable 1:1 mix ratio ease Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit

**Brand:** smooth-on
**Price:** ฿8175
**Availability:** ✅ In Stock

## Summary

> ⚡ Cast Fast, Finish Flawless – The Pro’s Secret Weapon!

## Quick Answers

- **What is this?** Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit by smooth-on
- **How much does it cost?** ฿8175 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/48505789-smooth-cast-300-liquid-plastic-urethane-casting-resin-trial-unit)

## Best For

- smooth-on enthusiasts

## Why This Product

- Trusted smooth-on brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Ultra-Low Viscosity:** Pour with precision and confidence—virtually bubble-free results without vacuum degassing.
- • **Rapid 15-Minute Cure:** Get durable, bright white castings faster than ever—no waiting, no fuss.
- • **Perfect 1:1 Mix Ratio:** Simplify your workflow with an equal parts formula that minimizes errors and waste.
- • **Moisture & Solvent Resistant:** Ensure long-lasting durability in your creations, resisting everyday wear and tear.
- • **Versatile Finish-Ready Material:** Sand, prime, and paint your castings to professional standards for flawless prototypes and props.

## Overview

Smooth Cast® 300 is a trial-size liquid urethane resin designed for fast, bubble-free casting with a convenient 1:1 mix ratio. It cures in just 15 minutes into a rigid, bright white plastic that’s easy to sand, prime, and paint. Ideal for prototyping, sculpting, and special effects, it offers moisture and mild solvent resistance for durable, professional-grade results.

## Description

Smooth-On Smooth Cast 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a one to one mix ratio (one part A to one part B by volume). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast Liquid Plastics include reproducing small to medium size sculptures,making prototype models, roto cast pieces, and special effect props.

Review: Awesome - Very good bought lots of this and will buy lots more easy to work with and great results all round
Review: Five Stars - Good buy. A little expensive. But works as moulds .u have to work fast and accurate

## Features

- Causes skin irritation.
- Harmful if inhaled.
- May cause allergy or asthma symptoms or breathing difficulties if inhaled.
- May cause an allergic skin reaction.
- May cause damage to organs through prolonged or repeated exposure.
- May cause respiratory irritation.
- Suspected of causing cancer.
- 15 minute cure time
- Rigid white plastic
- Low viscosity - easy to pour
- 1A:1B by volume mix ratio
- Can be sanded, primed and painted

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004BN7G0E |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 805,611 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 2,604 in Sculpting Moulding & Casting |
| Colour | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,115) |
| Date First Available | 17 Nov. 2012 |
| Grit Description | Fine |
| Grit Number | 300 |
| Item Package Quantity | 1 |
| Item Weight | 907 g |
| Item model number | 47641 |
| Manufacturer | Smooth-On, Inc. |
| Material | Urethane |
| Part Number | 47641 |
| Product Dimensions | 18.8 x 15.24 x 7.87 cm; 907.18 g |
| Size | Trial Unit |

## Product Details

- **Brand:** Smooth-On
- **Grit material:** Plastic
- **Grit type:** Fine
- **Item dimensions L x W x H:** 18.8 x 15.2 x 7.9 centimetres
- **Material:** Urethane

## Images

![Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit - Image 1](https://m.media-amazon.com/images/I/419hSj4q+vL.jpg)
![Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit - Image 2](https://m.media-amazon.com/images/I/41S27DREkbL.jpg)
![Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit - Image 3](https://m.media-amazon.com/images/I/41TyXHOmB1L.jpg)
![Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit - Image 4](https://m.media-amazon.com/images/I/41lw9QbdM-L.jpg)
![Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit - Image 5](https://m.media-amazon.com/images/I/51GXubYcTwL.jpg)

## Questions & Answers

**Q: Can I add glitter to this?**
A: 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.

**Q: 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?**
A: 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.

**Q: is it machinable?**
A: 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.

**Q: Is this a silicone or a urethane?**
A: This is a urethane casting resin.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Awesome
*by S***N on 8 November 2020*

Very good bought lots of this and will buy lots more easy to work with and great results all round

### ⭐⭐⭐⭐⭐ Five Stars
*by A***R on 23 October 2017*

Good buy. A little expensive. But works as moulds .u have to work fast and accurate

### ⭐⭐⭐⭐⭐ Pefect casr first time
*by C***G on 2 September 2016*

I had tried another brand of resin and had lots of issues with it not setting or only working with one type of silicone. There is no problem with this product; I mixed, pored and after 10 minutes had a perfect copy. Will use again.

## Frequently Bought Together

- Smooth-Cast™ 300: Bright White, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit
- Smooth-On Mold Star™ 16 Fast Platinum Silicone Rubber, Silicone Mold Making Kit - Pint Unit
- Smooth-On Universal Mold Release - 14 Fluid Ounce Aerosol Can

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**Shop now:** [https://www.desertcart.co.th/products/48505789-smooth-cast-300-liquid-plastic-urethane-casting-resin-trial-unit](https://www.desertcart.co.th/products/48505789-smooth-cast-300-liquid-plastic-urethane-casting-resin-trial-unit)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-25*