---
product_id: 1871175
title: "Smooth-Cast 300 - Bright White, Ultra Low Viscosity Liquid Plastic - Pint Unit"
brand: "smooth-on"
price: "€ 64.37"
currency: EUR
in_stock: true
reviews_count: 13
category: "Smooth On"
url: https://www.desertcart.fi/products/1871175-smooth-cast-300-bright-white-ultra-low-viscosity-liquid-plastic
store_origin: FI
region: Finland
---

# Ultra-low viscosity 80 cps Bright white, paintable finish Fast 3 min pot life & 10 min cure Smooth-Cast 300 - Bright White, Ultra Low Viscosity Liquid Plastic - Pint Unit

**Brand:** smooth-on
**Price:** € 64.37
**Availability:** ✅ In Stock

## Summary

> ⚡ Cast Fast, Cast Flawless – Elevate Your Craft Game!

## Quick Answers

- **What is this?** Smooth-Cast 300 - Bright White, Ultra Low Viscosity Liquid Plastic - Pint Unit by smooth-on
- **How much does it cost?** € 64.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/1871175-smooth-cast-300-bright-white-ultra-low-viscosity-liquid-plastic)

## 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

- • **Durable & Versatile:** Shore 70D hardness means tough, machinable, and paint-ready castings
- • **Speed Meets Precision:** Quick 3-minute pot life and 10-minute demold time to keep projects moving
- • **Bright White Brilliance:** Vibrant white resin ideal for professional-grade molds and prototypes
- • **Perfect Mix, Every Time:** Simple 1:1 volume ratio ensures hassle-free preparation
- • **Effortless Bubble-Free Casting:** No vacuum degassing needed for flawless results

## Overview

Smooth-Cast 300 is a premium ultra-low viscosity liquid plastic resin that delivers bright white, bubble-free castings without vacuum degassing. Featuring a convenient 1:1 mix ratio, a rapid 3-minute pot life, and a 10-minute cure time, it produces durable, machinable, and paintable parts with a Shore 70D hardness—perfect for professionals seeking speed and precision in their molding projects.

## 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: Great stuff! - I like that this cures really fast. Worked great for my mask project.
Review: Smooth cast - Great product. Sets up quick.

## Features

- Ultra-low viscosity casting resin with bright white color
- Vacuum degassing is not necessary to yield castings that are virtually bubble free.
- Pot Life: 3 minutes; Cure Time: 10 minutes
- Shore 70D
- Mix Ratio: 1A: 1B by Volume

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004BN7G0E |
| Best Sellers Rank | #8,364 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #93 in Sculpture Molding & Casting Products |
| Brand | Smooth-On |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,303) |
| Date First Available | November 10, 2010 |
| Grit Material | Plastic |
| Grit Number | 300 |
| Grit Type | Fine |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2 pounds |
| Item dimensions L x W x H | 7.4 x 6 x 3.1 inches |
| Item model number | 47641 |
| Manufacturer | Smooth-On, Inc. |
| Material | Plastic |
| Number of Items | 1 |
| Product Dimensions | 7.4 x 6 x 3.1 inches |
| UPC | 751635476417 |

## Product Details

- **Brand:** Smooth-On
- **Grit Material:** Plastic
- **Grit Type:** Fine
- **Item dimensions L x W x H:** 7.4 x 6 x 3.1 inches
- **Material:** Plastic

## Images

![Smooth-Cast 300 - Bright White, Ultra Low Viscosity Liquid Plastic - Pint Unit - Image 1](https://m.media-amazon.com/images/I/81gwmekNnqL.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

### ⭐⭐⭐⭐⭐ Great stuff!
*by M***E on December 13, 2025*

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

### ⭐⭐⭐⭐⭐ Smooth cast
*by G***0 on December 23, 2025*

Great product. Sets up quick.

### ⭐⭐⭐⭐⭐ Works Amazing. Used for Complex Thin Walled Two-Part Mold. Just Don't Add Filler/Color or Degas
*by B***N on December 18, 2024*

Worked perfectly for my needs. Very little bubbling even when pouring it directly into a two-part thin walled cast squish mold with very little venting built into the mold. Even though my casted part is probably 1/8 of an inch thick at its thickest point, and probably half that at it's thinnest, this product is still very durable. Surprisingly. I was expecting I may needed to get the Smooth Cast Task series product over the Smooth Cast 300 to get what I needed for such a thin cast. First attempt at a cast I tried degassing the mixed resin. Spent one minute mixing. And one minute or so degassing. Which should have left me with one final minute of potlife. Nope, within a 3 second period between having my eyes on the resin in the chamber, I look back and see a very hot eruption of resin that instant cured into a soft foam in the shape of magma pouring out of the cup like a volcano lol. Lesson #1 learned. No degassing. First cast I used release (really just cooking spray) and black pigment powder. And it came out horrible. Finish was rough and textured, and the color was grey although I used a ton of black pigment. And ultimately it made the cast extremely brittle and it broke in two places while sanding/trimming. Lesson #2 learned. No additives, and avoid release agents (or at least particularly non-cast specific release agents). Without any additives or any release (still released perfectly fine without any chemical release) it came out very smooth and very durable. It also sands amazingly well. Doesn't clog up sanding paper, sands down powdery and easily. Also the cast was a motorcycle helmet spoiler that isn't sold separately anywhere. Was a very expensive handmade Portuguese carbon fiber racing helmet. I decided to learn about molding and casting and made myself a new one using a spoiler to the same model I bought for my girlfriend as a gift. Think of, two birds one stone lol. Gift + master for my own spoiler. For my very first cast, being so complex as it was, and being such an amazing success.. I am completely happy with myself and the results of the various products I've used. Will say though, silicone mold making is definitely much more difficult than the resin casting process haha. Especially two part molds making with non-flat masters.

## 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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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-21*