---
product_id: 305257027
title: "Smooth-On Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit"
brand: "smooth-on"
price: "R$1078"
currency: BRL
in_stock: true
reviews_count: 5
category: "Smooth On"
url: https://www.desertcart.com.br/products/305257027-smooth-on-mold-star-15-slow-1a-1b-mix-by
store_origin: BR
region: Brazil
---

# 50 min pot life 450°F heat resistance 1:1 volume mix ratio Smooth-On Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit

**Brand:** smooth-on
**Price:** R$1078
**Availability:** ✅ In Stock

## Summary

> 🛠️ Mold like a pro, no sweat—precision and durability in every pour!

## Quick Answers

- **What is this?** Smooth-On Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit by smooth-on
- **How much does it cost?** R$1078 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/305257027-smooth-on-mold-star-15-slow-1a-1b-mix-by)

## 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

- • **High-Heat Compatibility:** Withstands up to 450°F, ideal for low-temp metal casting and diverse materials.
- • **Durable & Tear-Resistant:** Soft yet strong silicone rubber that stands up to repeated use.
- • **Exceptional Detail Capture:** Achieve crisp, bubble-free molds for professional-grade resin, wax, gypsum, and concrete casting.
- • **Effortless Precision Mixing:** No scales needed—just equal parts for flawless molds every time.
- • **Long Pot Life for Stress-Free Crafting:** 50 minutes to perfect your mix without rushing creativity.

## Overview

Smooth-On Mold Star 15 Slow is a platinum silicone rubber mold-making kit designed for professionals and hobbyists alike. It features a user-friendly 1:1 volume mix ratio, a generous 50-minute pot life, and cures in 4 hours to a soft, tear-resistant rubber that withstands heat up to 450°F. Perfect for casting wax, gypsum, resins, concrete, and low-temperature metal alloys, it delivers exceptional detail without the need for vacuum degassing or mold release sprays.

## Description

Smooth-On Mold Star 15 is an easy to use platinum silicone mold mix that cures to a soft, strong, tear resistant rubber. Mold Star 15 molds will last a long time and good for casting wax, gypsum, resins, concrete and more. Cured Mold Star rubber is heat resistant up to 450 degrees F and is suitable for casting low temperature melt metal alloys. Mold Star 15 is mixed to a 1A:1B ratio and has a pot life of 50 minutes and cure time of 4 hours. Mold Star does not require vavuum degassing & is not intended for brush on mold making. Contains 1 lb of Part A and 1 lb of Part B.

Review: I used this to mold ornate chess pieces and to make some cuppboard knobs in PU resin. It mixes simply and don't have to hurry (in fact I might look for a slightly faster version). I cast using a plastic cup and a paper cyclinder as a container and both worked fine and could be removed. neither of the masters (the resin chess pieces of wooden knobs) got stuck at all. The resulting mold has good, but flexibility but is fairly dense, the knob needed a split mold to get the bulbous part out. I cast with PU resin without any mold release spray and they came out of the mold easily and the level of detail was exceptional.
Review: This is my favorite mold maker, it doesn't harden too fast, and honestly, even if I mixed it fast and saw many bubbles, no bubbles formed for my molds. Will buy again.

## Features

- Easy to use platinum silicone mold mix
- Cure to soft, strong, tear resistant rubbers
- Good for casting wax, gypsum, resins, concrete and more
- Pot life of 50 minutes and cure time of 4 hours
- Mix ratio is 1A:1B by volume- no weighing scale necessary

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00ATDV5BQ |
| Brand | Smooth-On |
| Color | Green |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,116) |
| Date First Available | 20 November 2014 |
| Item Weight | 1.09 Kilograms |
| Material | Silicone |
| Model Number | 75163529244 |
| Product Dimensions | 19.3 x 14.99 x 7.87 cm; 1.09 kg |

## Product Details

- **Brand:** Smooth-On
- **Colour:** Green
- **Item dimensions L x W x H:** 19.3 x 15 x 7.9 centimeters
- **Material:** Silicone
- **Shape:** Custom

## Images

![Smooth-On Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit - Image 1](https://m.media-amazon.com/images/I/41Axo7OP4YL.jpg)

## Available Options

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

## Questions & Answers

**Q: Are these pints?  I am looking for the volume, not the weight and I can't seem to find it.**
A: They are pint bottles.

**Q: Is this enough to make a full set of rpg dice molds in small cups?**
A: I ran out after 6 of the 7 dice. I used 4 oz cups and was barely able to make the six molds. The molds did turn out great, though!

**Q: How well does this retain fine details?**
A: It does a great job with details.

**Q: What is the shelf life for parts A and B unmixed?**
A: Hey mOWWck, the shelf life is about 1 year (usually slightly longer than that) if you do not use them. This is an approximate number and based on our experiences in keeping the products in our store.  You should, however, place the products in a low humidity area to keep them longer. Do note that unused silicone last longer than unused resins before the products start gradually losing their properties (such as hardness etc.) Hope this helps and have a great day ahead!!

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by M***Y on 18 October 2021*

I used this to mold ornate chess pieces and to make some cuppboard knobs in PU resin. It mixes simply and don't have to hurry (in fact I might look for a slightly faster version). I cast using a plastic cup and a paper cyclinder as a container and both worked fine and could be removed. neither of the masters (the resin chess pieces of wooden knobs) got stuck at all. The resulting mold has good, but flexibility but is fairly dense, the knob needed a split mold to get the bulbous part out. I cast with PU resin without any mold release spray and they came out of the mold easily and the level of detail was exceptional.

### ⭐⭐⭐⭐⭐ Review
*by J***G on 28 January 2021*

This is my favorite mold maker, it doesn't harden too fast, and honestly, even if I mixed it fast and saw many bubbles, no bubbles formed for my molds. Will buy again.

### ⭐⭐⭐⭐⭐ Review
*by C***N on 30 March 2025*

Mold Star 15 Slow has been fantastic for my projects. It captures fine detail really well and gives me consistent, bubble-free results. The longer working time is a huge plus when I need extra time to get everything just right. But what really stood out was the customer support. I reached out to Smooth-On directly to figure out which silicone would be best for what I was doing, and they walked me through everything step by step. Later, when I had some trouble with my mixing technique, they were super helpful and patient—totally saved me from wasting materials. Great product backed by a great team. Highly recommend it if you're getting into mold making or want something reliable with solid support behind it.

## Frequently Bought Together

- Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit
- Smooth-Cast™ 300: Bright White, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit
- Smooth-On Universal™ Mold Release Spray, 14 fl. oz. Aerosol Can

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-03-04*