---
product_id: 266535687
title: "Smooth-Cast 300 Liquid Plastic Compound - Trial Unit"
brand: "smooth-on"
price: "B/.171"
currency: PAB
in_stock: true
reviews_count: 5
category: "Smooth On"
url: https://www.desertcart.com.pa/products/266535687-smooth-cast-300-liquid-plastic-compound-trial-unit
store_origin: PA
region: Panama
---

# 3 min pot life - ultra fast curing Bright white, paint-ready finish 70D Shore hardness - durable & machinable Smooth-Cast 300 Liquid Plastic Compound - Trial Unit

**Brand:** smooth-on
**Price:** B/.171
**Availability:** ✅ In Stock

## Summary

> ⚡ Cast fast, finish flawless – the pro’s secret weapon!

## Quick Answers

- **What is this?** Smooth-Cast 300 Liquid Plastic Compound - Trial Unit by smooth-on
- **How much does it cost?** B/.171 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/266535687-smooth-cast-300-liquid-plastic-compound-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

- • **One-to-one mix ratio:** Simplify your workflow with no guesswork
- • **No vacuum degassing needed:** Save time and equipment hassle every cast
- • **Tough, machinable & paintable:** Create professional-grade pieces that last
- • **Lightning-fast 3-minute pot life:** Get your projects done before the buzz fades
- • **Bubble-free, bright white castings:** Flawless results that demand attention

## Overview

Smooth-Cast 300 is a premium ultra-low viscosity liquid plastic resin offering a rapid 3-minute pot life and 10-minute demold time. Its one-to-one mix ratio and bubble-free bright white finish eliminate common casting hassles, while delivering durable, machinable, and paint-ready parts with a Shore hardness of 70D. Ideal for professionals seeking quick, high-quality results without vacuum degassing.

## Description

Smooth Cast 300 is a liquid plastic ,ultra-low viscosity casting resin that yields castings that are bright white and virtually bubble-free. Vacuum degassing is not necessary. It offers the convenience of a one to one mix ratio (by volume). 3 minute pot life: 10 minute demold time: Mixed viscosity 80 cps: 70D shore hardness Fully cured castings are tough, durable, machinable and paintable. Read MSDS before use - Adult Supervision Required. Keep Out of the Reach of Children - for more information visit www.smooth-on.com

Review: I like that this cures really fast. Worked great for my mask project.
Review: This product is so easy to use, doesn't have a bad smell so can be used indoors. You do have to be quick so be well prepared with moulds to use

## Features

- manufacturer: Smooth-On, Inc.
- Item Trademark: SMOOTH-ON
- material: Plastic

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004BN7G0E |
| Brand | Smooth-On |
| Capacity | 300 Liters |
| Color | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,246) |
| Date First Available | 17 November 2012 |
| Item Weight | 907 g |
| Material | Plastic |
| Model Number | 47641 |
| Product Dimensions | 18.8 x 15.24 x 7.87 cm; 907.18 g |

## Product Details

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

## Images

![Smooth-Cast 300 Liquid Plastic Compound - Trial Unit - Image 1](https://m.media-amazon.com/images/I/81gwmekNnqL.jpg)
![Smooth-Cast 300 Liquid Plastic Compound - Trial Unit - Image 2](https://m.media-amazon.com/images/I/71ZWTS1-Q2L.jpg)
![Smooth-Cast 300 Liquid Plastic Compound - Trial Unit - Image 3](https://m.media-amazon.com/images/I/81ubKEjBDDL.jpg)
![Smooth-Cast 300 Liquid Plastic Compound - Trial Unit - Image 4](https://m.media-amazon.com/images/I/71Koo4ru1vL.jpg)
![Smooth-Cast 300 Liquid Plastic Compound - Trial Unit - Image 5](https://m.media-amazon.com/images/I/71LJ0Lk-VZL.jpg)

## Available Options

This product comes in different **Size** options.

## 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

### ⭐⭐⭐⭐⭐ Review
*by M***E on 13 December 2025*

I like that this cures really fast. Worked great for my mask project.

### ⭐⭐⭐⭐⭐ Review
*by S***E on 21 May 2022*

This product is so easy to use, doesn't have a bad smell so can be used indoors. You do have to be quick so be well prepared with moulds to use

### ⭐⭐⭐⭐⭐ Review
*by M***O on 2 December 2021*

Perfect

## 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.com.pa/products/266535687-smooth-cast-300-liquid-plastic-compound-trial-unit](https://www.desertcart.com.pa/products/266535687-smooth-cast-300-liquid-plastic-compound-trial-unit)

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*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-02-20*